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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 42d

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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1
Understand that a standing wave is formed by the superposition of two traveling waves moving in opposite directions. The given wave function is y(x, t) = 4.44 mm sin[(32.5 rad/m)x] sin[(754 rad/s)t].
Identify the wave number (k) and angular frequency (ω) from the wave function. Here, k = 32.5 rad/m and ω = 754 rad/s.
Recall the relationship between wave speed (v), wave number (k), and angular frequency (ω). The wave speed v is given by the formula: v = ω / k.
Substitute the values of ω and k into the formula: v = 754 rad/s / 32.5 rad/m.
Perform the division to find the wave speed, ensuring units are consistent to obtain the speed in meters per second (m/s).

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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 zero, and antinodes, where the amplitude is maximum. Understanding the formation and properties of standing waves is crucial for analyzing the given wave function.
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Percorso guidato
07:58
Intro to Transverse Standing Waves

Wave Function

The wave function describes the displacement of a wave at any point in space and time. In the given problem, the wave function y(x, t) = 4.44 mm sin[(32.5 rad/m)x] sin[(754 rad/s)t] represents a standing wave, where the spatial and temporal components are separated, indicating the wave's behavior in space and time. This separation helps identify the characteristics of the traveling waves involved.
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Intro to Wave Functions

Wave Speed

Wave speed is the rate at which a wave propagates through a medium, calculated as the product of frequency and wavelength. For traveling waves forming a standing wave, the wave speed can be determined using the angular frequency (ω = 754 rad/s) and the wave number (k = 32.5 rad/m) from the wave function. The formula v = ω/k provides the wave speed, essential for solving the problem.
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Intro to Waves and Wave Speed
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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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