Question

Which of the following factors does not affect the speed of sound?

• A. Temperature
• B. Humidity
• C. Frequency
• D. Direction of wind

Answer 1

The correct option is C Frequency

Frequency does not affect the speed of sound. If the frequency of the sound wave in a medium is increased, it causes decrease in its wavelength so that the speed of sound wave remains constant.
On the other hand factors like temperature, humidity changes the density of the particles in the medium, which causes the change in speed of the sound wave.
Also, the speed of sound increases or decreases according to direction of wind. If wind is blowing in direction of propagation of sound, the speed of sound increases, while if it is blowing in the direction opposite to that of sound, the speed of sound decreases.