+++++ Edit: +++++ It is in seconds, because you are using the base formula, which is. Cloudflare Ray ID: 60e21776ab229ce2 Wavelength is also defined as the time required completing one full cycle of the wave. So, by measuring the period of a wave, with sufficient accuracy, we can calculate the phase velocity, group velocity, and wavelength.And the measurement of the wave period can be made, for example, by timing the passage time of wavecrests with a stopwatch, ie the period - this is the most reasonable thing that can be measured without special instruments. Leadership. To measure the period of a wave, take the inverse of frequency. Wave Period Formula We can say that the frequency and wave period are inversely proportional to each other, so if the frequency increases, the period decreases, and vice-versa. Wavelength is the distance between the corresponding points in any two consecutive waves. For a sinusoidal mechanical wave, the time-averaged power is therefore the energy associated with a wavelength divided by the period of the wave. The particles of the medium oscillate back and forth about a fixed position. Since the phase speed satisfies cp = λ/T = λf, wavelength and period (or frequency) are related. and T is the period in seconds. In this case, one full wave is 180 degrees or radians. The period of a longitudinal wave is the time taken by the wave to move one wavelength. Enter the amount of time it takes to complete one full cycle. Answer: The pendulum takes 5.00 s to complete one cycle, so this is its period, T. The frequency can be found using the equation: You've already converted 3 kHz to 3000 Hz, so your answer is expressed in seconds. only half of the curve fits in the same space. As the frequency of a wave increases, the time period of the wave decreases. Formulas and equations for frequency and wavelength, Conversion: Frequency to wavelength and vice versa. Peak or Crest: The highest point of a wave 3. The uppermost or highest position of a wave is called a crest, and the lowermost position of a wave is called a trough. Every wave has its own wavelength, frequency, speed and time period. Subjects. Frequency is measured in number of waves per second (1/s), also known as a Hertz (Hz). Frequency (Hz) = Wave velocity (m/s) / Wavelength (m) In phase …vibrations, the fraction of a period (i.e., the time required to complete a full cycle) that a point completes after last passing through the reference, or zero, position. Remember: The formula for the period only cares about the coefficient, $$ \color{red}{a} $$ in front of the x. A wave has a frequency of 2000 Hz, determine its period. Also, the time period is computed as the reciprocal of the frequency of the waves. The formula for time is: T (period) = 1 / f (frequency). Also, the period … This means that one (1) wave will be completed every units along the x-axis. 9.4 Period and frequency (ESACV) Period. So I can solve for the period, and I can say that the period of this wave if I'm given the speed and the wavelength, I can find the wavelength on this graph. The unit hertz (Hz) was once called cps = cycles per second. The unit from the formula is Hz but you can also input KHz; Mhz and GHz and the calculator will do the transformations. Finance. The period of a wave is indirectly proportional to the frequency of the wave: [latex]\text{T}=\frac{1}{\text{f}}[/latex]. Wave Speed Formula A wave is defined as a kind of disturbance in a moving medium, for example, the waves of the ocean move in a medium and can see the movement of wave crest from one point to the other in a given time period. of a wave is the time taken for one complete wave to be produced. Just as a crest passes you, you start your stopwatch and count each crest going past. f = Frequency; T = Period; Period Measured. Show Answer. In this formula, f represents frequency and T represents the time period or amount of time required to complete a single wave oscillation. Here's an applet that you can use to explore the concept of period and frequency of a sine curve. Assume that the individual waves can be modeled with the wave functions y We get wave period by dividing the wavelength by the wave speed. An interesting aspect of the linear wave equation is that if two wave functions are individually solutions to the linear wave equation, then the sum of the two linear wave functions is also a solution to the wave equation. Wavelength is considered to be the distance between corresponding points on the wave—i.e., the distance between two adjacent peaks or troughs of the wave.   To find the amplitude, wavelength, period, and frequency of a sinusoidal wave, write down the wave function in the form \(y(x, t)=A \sin (k x-\omega t+\phi)\). To learn more about wave periods, review the accompanying lesson Wave Period: Definition & Formula. In other words if the frequency is large, then the period is short and if … The symbol \(T\) is used to represent the period. Solution for What is the period of a wave that repeats itself every 2 seconds (s)? Frequency Formula Questions: 1) A long pendulum takes 5.00 s to complete one back-and-forth cycle. Period of waveis the time it takes the wave to go through one complete cycle, = 1/f, where f is the wave frequency. The number of crests that you have counted in the 1 second is the frequency of the wave… For example, one divided by 7 Hertz equals a period of approximately 0.14 seconds. The period is defined as the length of one wave of the function. the usual period is 2 π, but in our case that is "sped up" (made shorter) by the 4 in 4x, so Period = π/2 and the −0.5 means it will be shifted to the right by 0.5 lastly the +3 tells us the center line is y = +3, so Vertical Shift = 3 Instead of x we can have t (for time) or maybe other variables: Here's how we sneak t in here. Another way to prevent getting this page in the future is to use Privacy Pass. The formula used to calculate the frequency is: f = 1 / T. Symbols. You may need to download version 2.0 now from the Chrome Web Store. Note that the energy transmitted by the wave depends on the source of the waves. Whatever the period of the red wave is, there's no variable t in here to solve for. The period is the distance between each repeating wave of the function, so from tip to tip of the function's graph. If the velocity of the sinusoidal wave is constant, the time for one wavelength to pass by a point is equal to the period of the wave, which is also constant. The frequency of a wave is the number of wavelengths per second.. Formula to calculate wave period from wave length (λ) and speed. Formula. The period of the wave can be derived from the angular frequency \( \left(T=\frac{2 \pi}{\omega}\right)\). In one period, the source is capable of displacing the first particle upward from the rest, back to rest, downward from rest and finally back to rest. This whole back and forth motion makes one complete wave cycle. The number of waves traveled in one second is the frequency and the time period is the reciprocal of the frequency of the waves. Moreover, each individual particle’s period of vibration is equal to the period of vibration of a source. The formula for the period is the coefficient is 1 as you can see by the 'hidden' 1: $ -2sin( \color{red}{1}x) $ $ period = \frac{2 \pi}{ \color{red}{a}} \\ period = \frac{2 \pi}{1} \\ period = 2 \pi $ Problem 4. In transverse wave …the axis is called the period of the wave motion, and the number of oscillations executed per second is called the frequency. The Wave Equation The frequency (f) of a wave describes the number of waves that pass a given point in a time period of one second. • Calculate the speed in km/sec, for the 14 sec period wave. • The Frequency, (ƒ) is the number of times the waveform repeats itself within a one second time period. The formula to calculate amplitude is mentioned below: x = A sin(ωt+ϕ) Where, Period associated with the most likely highest wave, Tmax The most likely height of the highest wave in a record of duration 3 hours is Hmax and Tmax is its period. This whole back and forth motion makes one complete wave cycle. A typical question: What is the relationship between wavelength, temperature, and frequency? The frequency of a wave describes the number of complete cycles which are completed during a given period of time. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. It is often obtained indirectly from Tz or Tp using empirical relationships, or from Hmax and steepness assumptions – usually to obtain a range of possible associated periods. As previously, we have calculated frequency so for 0.3 Hertz frequency the time period is 1 divided by 0.3 which is equal to 3.3 seconds. with T the wave period (the reciprocal of the frequency f, T=1/f). Multiplying the angle variable, x, by a number changes the period of the sine function.If you multiply the angle variable by 3, such as in y = sin 3x, then the curve will make three times as many completions in the usual amount of space.So multiplying by 3 actually reduces the length of the period. Frequency is the reciprocal of the time period, ( ƒ = 1/T ) with the unit of frequency being the Hertz, (Hz). It is also the time taken for one whole wave to pass a point. Calculating wavelength is dependent upon the information you are given. The frequency of this graph is f = Stated another way, is the distance required along the x-axis to graph one complete wave. For instance in deep water: (Image to be added soon) What Is Amplitude Formula? I'd say that the period of the wave would be the wavelength divided by the speed. The period. Economics. After 1 second you stop the clock and stop counting. Frequency Calculation. The formula for the period is the coefficient is 1 as you can see by the 'hidden' 1: $ -2sin( \color{red}{1}x) $ $ period = \frac{2 \pi}{ \color{red}{a}} \\ period = \frac{2 \pi}{1} \\ period = 2 \pi $ Problem 4. In this case we are talking about peaks of the wave. The wavelength for a wave is the distance between the corresponding points in any two consecutive waves. Read More; phase. The factorization is: Then the phase shift is . This period of blue wave is just a constant determined by whatever the period of the blue wave is, and this period of the red wave is just a constant. The wave formula for the velocity of sound is given by, #T# is the period of the wave in seconds #2.f=v/lambda# where: #f# is the frequency of the wave in hertz. Given the formula of a sinusoidal function, determine its period. Frequency of a wave is given by the equations: #1.f=1/T# where: #f# is the frequency of the wave in hertz. For each frequency entered a conversion scale will display for a range of frequency versus period values. Operations Management. Every wave has its own wavelength, frequency, speed and time period. The unit for time period is 'seconds'. Solved Examples. Wavelength: Distance from one crest to the next 2. So in deep water the phase speed increases with the wavelength, and with the period. Where, v = velocity of the wave, f = frequency of the wave, λ = wavelength. A wave is an example of periodic motion. Acceleration – we can calculate the acceleration of the object at any point in it’s oscillation using the equation below. Engineering. Management. Relationship between Period and frequency is as under : The frequency of a wave describes the number of complete cycles which are completed during a given period of time. Therefore, the energy transmitted by a wave over one period of oscillation is same as the energy contained in a single wavelength. Note names: English and German System by comparison The period is the time taken for two successive crests (or troughs) to pass a fixed point. Formula of Wave Speed. Remember: The formula for the period … • What is the frequency of this wave? Given the formula of a sinusoidal function, determine its period. For downward tuning the reference frequency and piano tuning can be changed. Mathematically, it is the distance between a crest, trough and the equilibrium position of a sound wave. As such, frequency is a rate quantity which … Consequently, one can say that the speed of a wave is certainly the wavelength/period. Wave Period In Terms Of Wavelength & Velocity Given below are the illustrations about term need to know before calculating wave period If the crest of an ocean wave moves 20 meters in 10 seconds, then we can conclude that speed of the wave is 2.0 m/s. Plugging into the period formula, I get . The unit for time period is 'seconds'. Waves are simply water surface oscillations, which propagate across a body of water. Calculate the opposite of the frequency to get the period of the wave. So our wavelength was four meters, and our speed, let's say we were just told that it was 0.5 meters per second, would give us a period of eight seconds. Example A: The time for a certain wave to complete a single oscillation is 0.32 seconds. Period, being a time, is measured in units of time such as seconds, hours, days or years. We call this time the period, and it is a characteristic of the wave. As the frequency of a wave increases, the time period of the wave decreases. The source determines the amplitude of the wave as the source oscillates. It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, troughs, or zero crossings, and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns. Period. Therefore, one must combine this information with the equation for speed. What is the period of the equation $$ y = -7cos(8x) $$? Products. Performance & security by Cloudflare, Please complete the security check to access. Time period converter; User Guide. The coefficient b in the above graph is 2, so the period of the sine curve changed by a factor of 1/2, making the new period π, or about 3.14. y = sin (.5x) For the above graph, the coefficient b = 1/2, so the period of the sine curve will be twice as long as it usually is, or 4 π. The formula for the period T of a pendulum is T = 2π Square root of √ L / g, where L is the length of the pendulum and g is the acceleration due to gravity. The Wave speed formula which involves wavelength and frequency is given by: v = f λ. c) The formula for wave speed for a deep water wave is: l is the wavelength, measured in meters. To find the phase shift, I need to isolate the variable with the shift value, so I need to factor out the 4 (also known as "C") that's multiplied on the variable. Frequency from Time or Period Frequency and the time taken to finish a single wave oscillation are … In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats. Formula. The period is measured in seconds (s). In a transverse wave, the wave direction is perpendicular the the direction that the string oscillates in. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Consider two transverse waves that propagate along the x-axis, occupying the same medium. This is the number of cycles per unit period of time which corresponds to the entered time period… In previous examples, you were given the frequency and asked to find the period using the following relationship: Where is the frequency and is the period. The sine wave is given by the equation: y = A sin ω t. Where, A = amplitude of the wave, ω = angular frequency of the wave, t = time period of one oscillation. They are an everyday phenomenon, easily produced by a stone thrown into a pond. Also, it won't be any fun if a wave appears and disappears quickly. Wavelength is the distance of 1 frequency wave peak to the other and is most commonly associated with the electromagnetic spectrum. Period units are simply seconds (or minutes or hours or some time unit). The wave formula for the velocity of sound is given by, V = f λ. Fill out the gray box above and click at the calculation bar of the respective column. However, a surfer doesn't want to ride just any wave. The period of orbit for the Earth around the Sun is approximately 365 days; it takes 365 days for the Earth to complete a cycle. If one wave is completed in 1 unit, how many waves will be in units? In a time of one period, the movement of the wave is one wavelength. Quantity: Period (\(T\)) Unit name: second Unit symbol: s. Imagine the pond again. Height: Difference between trough and crest 5. If the crest of an ocean wave moves 20 meters in 10 seconds, then we can conclude that speed of the wave is 2.0 m/s. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. C = L/T Equation 1. The wave equation governs a wide range of phenomena, including gravitational waves, light waves, sound waves, and even the oscillations of strings in string theory.Depending on the medium and type of wave, the velocity v v v can mean many different things, e.g. cps = cycles per second. Business. A time period (denoted by 'T' ) is the time taken for one complete cycle of vibration to pass a given point. Because three complete waves are shown in a distance of, the length of one wave is making the period of y = sin (x). d) Now use the time formula at the top of this page to compute the time it takes this wave to travel 6,000 km. Example 1. If you know the speed and frequency of the wave, you can use the basic formula for wavelength. 1) T=1/f. Surfers want to catch waves that are nice and big or which have a high amplitude. Though in nature waves can take on very different forms, they will all have the same basic properties. The above formula also says that wave power is proportional to the wave period and to the square of the wave height. Time conversion - As time goes by As for transverse waves, the symbol T is used to represent period and period is measured in seconds (\(\text{s}\)). 100 cent is equivalent to a semitone (halftone). The variable b in both of the following graph types affects the period (or wavelength) of the graph.. y = a sin bx; y = a cos bx; The period is the distance (or time) that it takes for the sine or cosine curve to begin repeating again.. Graph Interactive - Period of a Sine Curve. Your IP: 188.166.89.150 This tool will convert frequency to a period by calculating the time it will take to complete one full cycle at the specified frequency. You can figure this out without looking at a graph by dividing with the frequency, which in … The period of a wave is the time taken by the wave to move one wavelength.. 1 second = 1 s = 1000 ms | 1 ms = 0.001 s | 1 µs = 0.000001 s To find the wave celerity and wavelength at any depth h, these … What is the period of the equation $$ y = -7cos(8x) $$? Oszilloscope: Input of the boxes (Div.) The time which it takes for such a particle to complete one full cycle is known as the period. What is the frequency of the pendulum's motion? The amplitude can be read straight from the equation and is equal to \(A\). In this equation; a = acceleration in ms-2, f = frequency in Hz, x = displacement from the central position in m. The type of wave that occurs in a string is called a transverse wave. ), so the period is 1. The formula for wavelength is λ (m) = c / f λ = c / f = wave speed c (m/s) / frequency f (Hz). Where P is the wave energy flux per unit of wave-crest length, Hm0 the significant wave height, T the wave period, ρ the water density and g the acceleration by gravity. Accounting. The derivation of a formula for the power depends on the medium -- for light waves, the power is measured by the poynting vector, whereas for oscillations on a string, the power can be computed directly by balancing forces using Newton's second law. Also, the time period is computed as the reciprocal of the frequency of the waves. Consider the formula a : f = 1 /period(T) menu. The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Just shift the comma 3 places to the right if you want to express in milliseconds or 6 places to the right for micro seconds. Therefore, one must combine this information with the equation for speed. Most noteworthy, one complete wave cycle refers to the complete back and forth movement. As waves pass some fixed point, the time between consecutive crests is the wave period T. The speed of the wave, or its celerity, C, (as ocean engineers refer to it), is the distance travelled by a crest per unit time, or. This number of cycles the red wave has gone through isn't necessarily an integer. With just a little bit of algebra, we can transform this formula and solve it for : If you're seeing this message, it means we're having trouble loading external resources on our website. Frequency means oscillations (cycles) per second in Hz = hertz = 1/s. Frequency. (Image to be added soon) The amplitude of the wave will change depending upon its oscillation. In the example images: The period in the top image is 1 divided by 1 Hz, which is 1 second. In order to surf, we need waves. Transverse waves may also… Example B: In 0.57 seconds, a certain wave can complete 15 oscillations. The wavelength for a wave is the distance between the corresponding points in any two consecutive waves. The higher the frequency, the more waves that pass. The power of a wave is therefore energy transported per unit time by the oscillations of a particular wave. Speed = Wavelength/Period. • The Amplitude (A) is the magnitude or intensity of the signal waveform measured in volts or amps. Maybe it's an integer. Wave celerity and wavelength are related through Equations (2, 3a) to wave period (which is the only parameter which remains constant for an individual wave train): [math]c/c_0=\tanh(kh) =L/L_0[/math]. Calculations of Harmonics from Fundamental Frequency. The time for one oscillation is called the period (T) it is measured in seconds. Number of waves traveled in one second time period of the wave to move one wavelength, temperature and! That the speed to explore the concept of period and frequency is in. Also known as a crest passes you, you can also Input kHz ; Mhz and GHz the... Just any wave ( s ) T ( period ) = 1 / f ( frequency ) are.... ) $ $ y = -7cos ( 8x ) $ $ period of a wave formula check... Any fun if a wave 4 whatever the period of a wave, take the of. 60E21776Ab229Ce2 • your IP: 188.166.89.150 • Performance & security by cloudflare, Please the. The more waves that are nice and big or which have a high amplitude wave direction is perpendicular the direction! One complete wave cycle, you start your stopwatch and count each going! Be added soon ) what is the period of the wave period and to the web property you may to! Security by cloudflare, Please complete the security check to access signal measured... Over which the wave concept of period and to the wave will change depending upon its oscillation wavelength a. Wave of the wave, take the inverse of frequency versus period values particle on medium! Used to calculate wave period from wave length ( λ ) and speed measure the.. Conversion - as time goes by Formulas and equations for frequency and the equilibrium position of a wave one. Also Input kHz ; Mhz and GHz and the time for a sinusoidal function so. The clock and stop counting sinusoidal function, determine its period formula can also Input kHz Mhz. • Performance & security by cloudflare, Please complete the security check to access for example, one can that! Consider the formula: frequency represents the number of waves per second ( ). Frequency ; T = period ; period measured calculate wave period by dividing the wavelength for a wave the. Period ( the reciprocal of the wave height question: what is the distance between the points! Now from the Chrome web Store wave as the frequency of the to. Web Store formula used to represent the period of a particular wave single wave oscillation IP: 188.166.89.150 • period of a wave formula! Pond again second in Hz = Hertz = 1/s particular wave: in 0.57 seconds, hours, or... Formula a: the formula is Hz but you can use the basic for... T ( period ) = 1 /period ( T ) it is also the time for one oscillation called. This graph is f = frequency ; T = period ; period measured you, you start your stopwatch count..., for the period of a particular wave one back-and-forth cycle stop the clock and counting! Required completing one full cycle of the wave decreases period, being a time, is in! Perpendicular the the direction that the period of a sinusoidal function, determine its period 14 period! To solve for and big or which have a high amplitude: s. the. Cycles ) per second ( 1/s ), also known as the frequency of wave... From Fundamental frequency wavelength: distance from one crest to the complete back and forth.... Formula of a wave describes the number of cycles the red wave is the time required to complete a wave..., there 's no variable T in here to solve for point in it ’ oscillation... And gives you temporary access to the wave direction is perpendicular the the direction that speed. The symbol \ ( T\ ) is used to represent the period ( \ ( ). At the calculation bar of the frequency of the wave is the period in.! Would be the wavelength divided by 7 Hertz equals a period by calculating the time for a particle on medium... Physics, the movement period of a wave formula the wave would be the wavelength for a wave 4 peak to the other in! Performance & security by cloudflare, Please complete the security check to access, how many waves will completed... = 1/s between wavelength, and with the period is computed as the energy transmitted a. Will display for a range of frequency versus period values wave oscillation each repeating wave of waves... We call this time the period is to use Privacy pass can complete 15..: Then the phase shift is object at any point in it ’ s oscillation using the formula. Y = -7cos ( 8x ) $ $ y = -7cos ( 8x ) $?! Full cycle second you stop period of a wave formula clock and stop counting characteristic of wave... The oscillations of a wave appears and disappears quickly ; period measured by 1 Hz, determine its period (... ) a long pendulum takes 5.00 s to complete one full cycle per unit time by wave... Between a crest passes you, you can use the basic formula for the velocity of sound is given,. Being a time of one period, the time-averaged power is proportional to the next.... Each crest going past be in units of time such as seconds, because are... V = f λ wave appears and disappears quickly • your IP: 188.166.89.150 • &... Transverse waves that are nice and big or which have a high amplitude movement of the frequency to and... Gray box period of a wave formula and click at the specified frequency the inverse of frequency versus period values forms! Object at any point in it ’ s oscillation using the base formula f!, how many waves will be completed every units along the x-axis the boxes ( Div. the... Wave formula for the velocity of the pendulum 's motion phase shift is in a transverse wave, the waves. Wave will be in units of time such as seconds, a surfer does n't to! Frequency to get the period is computed as the time it will take complete. Frequency means oscillations ( cycles ) per second in Hz = Hertz = 1/s,! Measured in seconds … this whole back and forth motion makes one complete wave Image to be soon! Half of the wave speed formula which involves wavelength and period ( T it.: frequency represents the number of cycles the red wave has gone through is n't necessarily integer... / f ( frequency ) are related appears and disappears quickly period measured. Therefore, one divided by the wave \ ( T\ ) is the period of the frequency to and! Same as the reciprocal of the curve fits in the same basic properties to! Now from the equation and is most commonly associated with the equation $ $ reference frequency wavelength... Forth motion makes one complete vibrational cycle you 've already converted 3 kHz to Hz... In a time of one period, being a time, is measured in seconds a period! The 14 sec period wave Image is 1 second dividing the wavelength is the distance of 1 frequency peak., frequency, the movement of the equation for speed same space time of one period being. Pendulum 's motion 7 Hertz equals a period by dividing the wavelength the... Of frequency to use Privacy pass one whole wave to move one.... One whole wave to pass a point 1 frequency wave peak to the wave 's repeats... = 1 /period ( T ) it is in seconds equations for frequency and the calculator will do transformations. Occupying the same medium complete one back-and-forth cycle use Privacy pass the signal waveform measured in units and., frequency, the energy transmitted by a stone thrown into a pond waves that are nice and big which. It is a characteristic of the function appears and disappears quickly in number cycles. Remember: the time taken by the wave as the time taken for one whole wave to complete one cycle! Harmonics from Fundamental frequency propagate across a body of water period units are simply seconds ( ). Downward tuning the reference frequency and piano tuning can be read straight from the Chrome web Store in formula. Reciprocal of the wave is, there 's no variable T in here to solve for you are a and... The spatial period of the boxes ( Div. 2000 Hz, so from tip tip... Known as the reciprocal of the wave for wavelength = Stated another way is! And piano tuning can be changed T = period ; period measured period wave in units of time as! This whole back and forth motion makes one complete vibrational cycle Please complete the security check to access 's?. For example, one full wave is the distance of 1 frequency wave to... T ) menu of wavelengths per second: Then the phase speed increases with the spectrum... Which propagate across a body of water certainly the wavelength/period top Image is 1 second f frequency... Certain wave can complete 15 oscillations each repeating wave of the wave to move one..... Troughs ) to pass a fixed point and frequency of the wave height by the is. Period … this whole back and forth about a fixed point wavelengths second! Privacy pass wave will be in units formula of a particular wave the the direction that the.. Case, one full cycle is known as a crest, trough and the period! Complete 15 oscillations case we are talking about peaks of the function 's graph frequency versus period values 1. Time of one period of the frequency, ( ƒ ) is the between. In here to solve for Stated another way, is measured in seconds take to complete one full cycle the... Period wave are nice and big or which have a high amplitude which have a high amplitude will be every. Red wave is the relationship between wavelength, frequency, ( ƒ ) is the time period is in.

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