Chapter 15, Problem 69A

a.

To determine

To find: what happens to the frequency of sound when the temperature increases.

Explanation of Solution

Introduction:

The speed of sound increases by $0.6\text{ m/s}$ for each degree Celsius when the temperature increases.

Change in temperature does not change the frequency of the sound. Therefore, there is no change in frequency of sound when the temperature changes.

Conclusion:

There is no change in frequency of sound when the temperature increases.

b.

To determine

To find: what happens to the wavelength of sound if there is a change in temperature.

Answer to Problem 69A

The wavelength increases with the change in temperature.

Explanation of Solution

Introduction:

The speed of sound increases by $0.6\text{ m/s}$ for each degree Celsius when the temperature increases.

When the temperature increases, the wavelength of sound also increases. Therefore, the wavelength of a sound increases with the increase in temperature.

Conclusion:

The wavelength of a sound increases with the increase in temperature.