Question

If a sound wave takes 8.4 s to complete 4 cycles, then its time period is?

• A. 2.1 s
• B. 21 s
• C. 0.21 s
• D. 1.2 s

Answer 1

The correct option is A

2.1 s

Given that, a sound wave makes 4 cycles in 8.4 s, then to find the time period of a wave which is nothing but the time taken by a wave to complete one cycle we divide the total time by number of cycles.

i.e. period of given sound wave is given by,

T = $\frac{8.4}{4}$

i.e. T = 2.1 s (Answer)