Question

A sound wave during propagation produces 40 compressions and 40 rarefactions in one second. Find the frequency of the wave.

• A. 40 Hz
• B. 50 Hz
• C. 45 Hz
• D. 55 Hz

Answer 1

The correct option is A 40 Hz

One complete oscillation consists of one compression and one rarefaction. Here, the sound wave produces 40 compressions and 40 rarefactions in one second. Thus, the sound wave completes 40 oscillations in one second.
As we know frequency is the number of oscillations completed in one second.
Hence, the frequency of the given sound wave is 40 Hz.