Question

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

• A. $1.25s^{-1}$
• B. $2.5s^{-1}$
• C. $7.5s^{-1}$
• D. $75s^{-1}$

Answer 1

The correct option is A $1.25s^{-1}$

To calculate the frequency in hertz, we have to measure the time in seconds.
That is, t= 1 minute = 60 seconds.
Number of time it beats = 75 times per minute.
Frequency is given as,

Number of times it beats/Total time taken in seconds = 75/60 = 1.25 Hz.

Hence, the frequency of a man's heartbeat is 1.25 times per second.