Question

A sound wave source produces 40 crests and 40 troughs in 0.2 second. Find the frequency of the wave?

Answer 1

Step 1- Given that

Number of waves $n=40$

Time taken$t=0.2s.$

Step 2- Finding the total number of vibrations per second.

To find out the frequency, we have to divide the number of waves by the time taken.

Calculating the frequency, we have, frequency,

$$\begin{gathered} f=\frac{n}{t} \\ f=\frac{40}{0.2}=200Hz. \end{gathered}$$

Thus, the frequency of the wave is $200Hz.$