/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 4 Which of the following transvers... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

Which of the following transverse waves has the greatest power? a) a wave with velocity \(v\), amplitude \(A\), and frequency \(f\) b) a wave of velocity \(v\), amplitude \(2 A\), and frequency \(f / 2\) c) a wave of velocity \(2 v\), amplitude \(A / 2\), and frequency \(f\) d) a wave of velocity \(2 v\), amplitude \(A\), and frequency \(f / 2\) e) a wave of velocity \(v\), amplitude \(A / 2\), and frequency \(2 f\)

Short Answer

Expert verified
a) Wave with amplitude A, velocity v, and frequency f. b) Wave with amplitude 2A, velocity v, and frequency f/2. c) Wave with amplitude A/2, velocity 2v, and frequency f. d) Wave with amplitude A, velocity 2v, and frequency f/2. e) Wave with amplitude A/2, velocity v, and frequency 2f. Answer: Both b) and e), as each has the same power: \(B \cdot f^2 \cdot A^2 \cdot v\).

Step by step solution

01

Calculate the power of wave a

Using the formula \(P = \frac{1}{2} \cdot B \cdot f^2 \cdot A^2 \cdot v\), we can rewrite the power of wave a in terms of \(B\), \(f\), \(A\), and \(v\): \(P_a = \frac{1}{2} \cdot B \cdot f^2 \cdot A^2 \cdot v\).
02

Calculate the power of wave b

Using the formula for power, we can rewrite the power of wave b in terms of \(B\), \(f\), \(A\), and \(v\): \(P_b = \frac{1}{2} \cdot B \cdot (f / 2)^2 \cdot (2 A)^2 \cdot v = \frac{1}{2} \cdot B \cdot (1/4) \cdot f^2 \cdot (4 \cdot A^2) \cdot v = B \cdot f^2 \cdot A^2 \cdot v\).
03

Calculate the power of wave c

Using the formula for power, we can rewrite the power of wave c in terms of \(B\), \(f\), \(A\), and \(v\): \(P_c = \frac{1}{2} \cdot B \cdot f^2 \cdot (A / 2)^2 \cdot 2 v = \frac{1}{2} \cdot B \cdot f^2 \cdot (1/4 \cdot A^2) \cdot 2 v = \frac{1}{4}B \cdot f^2 \cdot A^2 \cdot v\).
04

Calculate the power of wave d

Using the formula for power, we can rewrite the power of wave d in terms of \(B\), \(f\), \(A\), and \(v\): \(P_d = \frac{1}{2} \cdot B \cdot (f/2)^2 \cdot A^2 \cdot 2 v = \frac{1}{2} \cdot B \cdot (1/4) \cdot f^2 \cdot A^2 \cdot 2 v = \frac{1}{4}B \cdot f^2 \cdot A^2 \cdot v\).
05

Calculate the power of wave e

Using the formula for power, we can rewrite the power of wave e in terms of \(B\), \(f\), \(A\), and \(v\): \(P_e = \frac{1}{2} \cdot B \cdot (2f)^2 \cdot (A/2)^2 \cdot v = \frac{1}{2} \cdot B \cdot 4 \cdot f^2 \cdot (1/4 \cdot A^2) \cdot v = B \cdot f^2 \cdot A^2 \cdot v\).
06

Compare the powers

Comparing the powers of all the waves, we find that: - \(P_a = \frac{1}{2}B \cdot f^2 \cdot A^2 \cdot v\) - \(P_b = B \cdot f^2 \cdot A^2 \cdot v\) - \(P_c = \frac{1}{4}B \cdot f^2 \cdot A^2 \cdot v\) - \(P_d = \frac{1}{4}B \cdot f^2 \cdot A^2 \cdot v\) - \(P_e = B \cdot f^2 \cdot A^2 \cdot v\) Clearly, the greatest power is shared by wave b and wave e, both having power equal to \(B \cdot f^2 \cdot A^2 \cdot v\). So, the correct answer is both b) and e).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Wave Velocity
Wave velocity, commonly symbolized as v, is a fundamental concept in wave physics, referring to the speed at which waves propagate through a medium. This medium could be anything from air and water to the vacuum of space in the case of electromagnetic waves. The velocity of a wave is determined by the type of wave and the properties of the medium, and it remains constant as long as those properties don't change.

The velocity of a transverse wave, which is the type of wave in our exercise, can be calculated using the formula:
\[ v = f\times \lambda \]
where f represents the frequency of the wave and \lambda (lambda) is the wavelength. Note that this formula implies that any changes in frequency or wavelength directly affect the wave's velocity, as long as the medium remains the same. Understanding wave velocity is essential when comparing the power of waves, as a higher velocity can contribute to a greater transfer of energy over a distance per unit time.
Wave Amplitude
Wave amplitude, denoted typically by A, is a measure of the maximum displacement of particles from their rest position as a wave passes through a medium. Think of it as the height of a wave crest above the rest level or the depth of a trough below it. The amplitude of a wave is directly related to the energy carried by the wave; a greater amplitude means the wave has more energy.

When addressing the power of waves, amplitude plays a crucial role. The formula used in the example exercise incorporates amplitude squared (\(A^2\)), meaning that the power transmitted by the wave increases with the square of the amplitude. This relationship highlights why a wave with twice the amplitude doesn't just double the power; it actually increases it by four times, provided other factors remain constant.
Wave Frequency
The frequency of a wave, symbolized as f, describes the number of cycles that pass a point in one second. Measured in Hertz (Hz), frequency is intrinsic to a wave's identity, like pitch is to a sound. High-frequency waves have closely packed cycles, while low-frequency waves have cycles that are spread out.

In the context of the transverse wave power calculation, frequency influences the energy transfer rate. According to the wave power formula used in our problem, the power is proportional to the square of the frequency (\(f^2\)). Therefore, if the frequency of a wave is doubled, all else being equal, the power transmitted by the wave will increase by a factor of four, indicating a strong dependence on frequency for the wave's power.
Power Calculation of Waves
The power transmitted by a wave is a measure of the energy transferred by the wave per unit time. In the given exercise, the power calculation for a transverse wave involves the formula:
\[P = \frac{1}{2} \cdot B \cdot f^2 \cdot A^2 \cdot v\]
In this equation, P stands for power, B for a proportionality constant that depends on the medium and type of wave, f for the wave's frequency, A for amplitude, and v for velocity. From the solution steps, we see that both square of the amplitude (\(A^2\)) and square of the frequency (\(f^2\)) have a significant impact on the power. Therefore, any changes to the amplitude or frequency will exponentially affect the wave's power.

By comparing the power calculations of various waves with different velocities, amplitudes, and frequencies, we can determine which wave carries the most energy. It's also crucial to note that the velocity and amplitude in the exercise refer to peak or maximum values, which directly correlate to the wave's energy-carrying capacity.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

The largest tension that can be sustained by a stretched string of linear mass density \(\mu\), even in principle, is given by \(\tau=\mu c^{2},\) where \(c\) is the speed of light in vacuum. (This is an enormous value. The breaking tensions of all ordinary materials are about 12 orders of magnitude less than this.) a) What is the speed of a traveling wave on a string under such tension? b) If a \(1.000-\mathrm{m}\) -long guitar string, stretched between anchored ends, were made of this hypothetical material, what frequency would its first harmonic have? c) If that guitar string were plucked at its midpoint and given a displacement of \(2.00 \mathrm{~mm}\) there to produce the fundamental frequency, what would be the maximum speed attained by the midpoint of the string?

A \(3.00-\mathrm{m}\) -long string, fixed at both ends, has a mass of \(6.00 \mathrm{~g}\). If you want to set up a standing wave in this string having a frequency of \(300 . \mathrm{Hz}\) and three antinodes, what tension should you put the string under?

Suppose that the tension is doubled for a string on which a standing wave is propagated. How will the velocity of the standing wave change? a) It will double. c) It will be multiplied by \(\sqrt{2}\). b) It will quadruple. d) It will be multiplied by \(\frac{1}{2}\).

Consider a guitar string stretching \(80.0 \mathrm{~cm}\) between its anchored ends. The string is tuned to play middle \(\mathrm{C},\) with a frequency of \(256 \mathrm{~Hz}\), when oscillating in its fundamental mode, that is, with one antinode between the ends. If the string is displaced \(2.00 \mathrm{~mm}\) at its midpoint and released to produce this note, what are the wave speed, \(v\), and the maximum speed, \(V_{\text {max }}\), of the midpoint of the string?

A sinusoidal wave traveling in the positive \(x\) -direction has a wavelength of \(12 \mathrm{~cm},\) a frequency of \(10.0 \mathrm{~Hz},\) and an amplitude of \(10.0 \mathrm{~cm}\). The part of the wave that is at the origin at \(t=0\) has a vertical displacement of \(5.00 \mathrm{~cm} .\) For this wave, determine the a) wave number, d) speed, b) period, e) phase angle, and c) angular frequency, f) equation of motion.

See all solutions

Recommended explanations on Physics Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.