Question

The heart of man beats $75$ times a minute . What is its frequency ?

Answer 1

Number of beats in $1$min or $60$s$=75$

Number of beats in $1$s$=\frac{75}{60}=1.25$

Number of heart beats in $1$ second is the frequency of the wave.

$\therefore$ frequency of the heart beat$=1.25$Hz.