Question

A source of wave produces 40 crests and 40 troughs in 0.4 seconds.Find the frequency of the wave.

Answer 1

The expression for the frequency of the wave is given as,
$frequency=\frac{No.ofcrestandtroughformedbythewave}{timetaken}$
On substituting the values in the above equation we get,
$$\begin{gathered} \nu =\frac{40}{0.4s} \\ \nu =100s^{-1} \\ \nu =100Hz \end{gathered}$$