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Ch 15: Mechanical Waves
Young & Freedman Calc - University Physics 14th Edition
Young & Freedman Calc14th EditionUniversity PhysicsISBN: 9780321973610Non è quello che usi tu?Cambia libro di testo
Capitolo 15, Problema 42c

The wave function of a standing wave is y(x,t)=4.44 mmsin[(32.5 rad/m)x]sin[(754rad/s)t]y(x,t)=4.44\(\text{ mm}\)\(\sin\)[(32.5\(\text{ rad/m}\))x]\(\sin\)[(754\(\text{rad/s}\))t]. For the two traveling waves that make up this standing wave, find the frequency.

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1
Identify the general form of the wave function for a standing wave, which is given by: y(x,t)=Asin[kx]sin[ωt], where A is the amplitude, k is the wave number, and ω is the angular frequency.
From the given wave function y(x,t)=4.44mmsin[32.5rad/m]xsin[754rad/s]t, identify the angular frequency ω as 754rad/s.
Recall the relationship between angular frequency ω and frequency f: ω=2πf.
Rearrange the formula to solve for frequency f: f=ω2π.
Substitute the given angular frequency ω=754rad/s into the equation to find the frequency f.

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Standing Waves

Standing waves are formed by the superposition of two traveling waves moving in opposite directions with the same frequency and amplitude. They are characterized by nodes, where the wave amplitude is always zero, and antinodes, where the amplitude is maximum. Understanding standing waves is crucial for analyzing the given wave function.
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07:58
Intro to Transverse Standing Waves

Wave Function

A wave function describes the displacement of a wave at any point in space and time. In the given function y(x, t) = 4.44 mm sin[(32.5 rad/m)x] sin[(754 rad/s)t], the spatial part sin[(32.5 rad/m)x] and the temporal part sin[(754 rad/s)t] indicate the wave's behavior in space and time, respectively. This function is essential for identifying the properties of the wave, such as frequency.
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Intro to Wave Functions

Frequency of a Wave

Frequency refers to the number of oscillations or cycles a wave completes in one second, measured in hertz (Hz). It is related to the angular frequency (ω) by the formula f = ω/(2π). In the given wave function, the angular frequency is 754 rad/s, which can be used to calculate the frequency of the traveling waves that form the standing wave.
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Circumference, Period, and Frequency in UCM
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The wave function of a standing wave is y(x,t)=4.44 mmsin[(32.5 rad/m)x]sin[(754rad/s)t]y(x,t)=4.44\(\text{ mm}\)\(\sin\)[(32.5\(\text{ rad/m}\))x]\(\sin\)[(754\(\text{rad/s}\))t]. For the two traveling waves that make up this standing wave, find the wavelength.

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The wave function of a standing wave is y(x,t)=4.44 mmsin[(32.5 rad/m)x]sin[(754rad/s)t]y(x,t)=4.44\(\text{ mm}\)\(\sin\)[(32.5\(\text{ rad/m}\))x]\(\sin\)[(754\(\text{rad/s}\))t]. For the two traveling waves that make up this standing wave, find the amplitude.

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The wave function of a standing wave is y(x,t)=4.44 mmsin[(32.5 rad/m)x]sin[(754rad/s)t]y(x,t)=4.44\(\text{ mm}\)\(\sin\)[(32.5\(\text{ rad/m}\))x]\(\sin\)[(754\(\text{rad/s}\))t]. For the two traveling waves that make up this standing wave, find the wave speed.

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