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Physics Principles with Applications
Found in: Page 328
Physics Principles with Applications

Physics Principles with Applications

Book edition 7th
Author(s) Douglas C. Giancoli
Pages 978 pages
ISBN 978-0321625922

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Short Answer

When a sound wave passes from air into water, do you expect the frequency or wavelength to change?

When the wave is going from air to water, the wavelength changes due to wave speed, the speed of the sound wave is four times in water than in air. Therefore, the wavelength in water is four times longer than in air.

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Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Write the concept when sound is travelling from one medium to another

If the wave's frequency is changing, then the two mediums cannot be in contact. When the frequency of vibration is different for two mediums, then the particle of mediums cannot stay in contact. But in order to transmit a wave, the particles must be in contact. So, the frequency will not change.

Write the behaviour of sound wave when it is going from air to water 

When the wave is going from air to water, the speed of the wave will change, but the frequency will remain the same, but the wavelength will change. The speed of the sound wave is four times in water than in air. Therefore, the wavelength in water is four times longer than in air.

Most popular questions for Physics Textbooks

Question: A tuning fork is set into vibration above a vertical open tube filled with water (Fig 12-40). The water level is allowed to drop slowly. As it does so, the air in the tube above the water level is heard to resonate with the tuning fork when the distance from the tube opening to the water level is 0.125 m and again at 0.395 m. What is the frequency of the tuning fork?

FIGURE 12–40 Problem 79.

Question: (II) (a) Determine the length of an open organ pipe that emits middle C (262 Hz) when the temperature is 18°C. (b) What are the wavelength and frequency of the fundamental standing wave in the tube? (c) What are \(\lambda \)and f in the traveling sound wave produced in the outside air?

Question: (II) (a) Estimate the power output of sound from a person speaking in normal conversation. Use Table 12-2. Assume the sound spreads roughly uniformly over a sphere centered on the mouth. (b) How many people would it take to produce a total sound output of 60 W of ordinary conversation? (Hint: Add intensities, not dBs.)

You are trying to decide between two new stereo amplifiers. One is rated at 75 W per channel and the other is rated at 120 W per channel. In terms of dB, how much louder will the more powerful amplifier be when both are producing sound at their maximum levels?

Question: Two loudspeakers are at opposite ends of a railroad car as it moves past a stationary observer at\({\bf{12}}{\bf{.0}}\,{\bf{m/s}}\), as shown in Fig. 12–41. If the speakers have identical sound frequencies of \({\bf{348}}\,{\bf{Hz}}\), what is the beat frequency heard by the observer when (a) he listens from position A, in front of the car, (b) he is between the speakers, at B, and (c) he hears the speakers after they have passed him, at C?

Fig. 12-41
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