A sound wave propagates in air at 21°C with frequency 4.50 kHz. It passes through a region where the temperature gradually changes, and then it moves through air at 0°C. (a) What happens to the speed of the wave? The speed decreases because of the decrease in the air's density. O The speed increases because of the decrease in the air's density. O The speed decreases because of the increase in the air's density. O The speed increases because of the increase in the air's density. O The speed remains unchanged. X What is the speed of the wave at 0°C? 331 ✓ m/s (b) What happens to its frequency? O The frequency increases with the decrease in temperature. O The frequency decreases with the decrease in temperature. O The frequency remains unchanged. What is the frequency of the wave at 0°C? kHz (c) What happens to its wavelength? O The wavelength increases because the wave crests are closer together. O The wavelength decreases because the wave crests are further apart. O The wavelength increases because the wave crests are further apart. O The wavelength decreases because the wave crests are closer together. O The wavelength remains unchanged. What is the wavelength of the wave at 0°C? m

A sound wave propagates in air at 21°C with frequency 4.50 kHz. It passes through a region where the temperature gradually changes, and then it moves through air at 0°C. (a) What happens to the speed of the wave? The speed decreases because of the decrease in the air's density. O The speed increases because of the decrease in the air's density. O The speed decreases because of the increase in the air's density. O The speed increases because of the increase in the air's density. O The speed remains unchanged. X What is the speed of the wave at 0°C? 331 ✓ m/s (b) What happens to its frequency? O The frequency increases with the decrease in temperature. O The frequency decreases with the decrease in temperature. O The frequency remains unchanged. What is the frequency of the wave at 0°C? kHz (c) What happens to its wavelength? O The wavelength increases because the wave crests are closer together. O The wavelength decreases because the wave crests are further apart. O The wavelength increases because the wave crests are further apart. O The wavelength decreases because the wave crests are closer together. O The wavelength remains unchanged. What is the wavelength of the wave at 0°C? m

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter13: Mechanical Waves

Section13.7: The Doppler Eff Ect

Problem 13.7QQ

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