Question

A source of sound produces 10 crests and 10 troughs in $0.1s$. Find the frequency of the sound produced.

• A. $50Hz$
• B. $25Hz$
• C. $100Hz$
• D. $200Hz$

Answer 1

The correct option is C $100Hz$

The given source of sound produces 10 crests and 10 troughs in $0.1s$.
This implies that, in $0.1s$, the wave completes 10 oscillations.
The number of oscillations the sound would complete in 1 s = $10\times 10$ = $100$ oscillations.
Thus, the frequency of the sound is $100Hz$.