Question

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

• A. $0.75s$
• B. $1.33s$
• C. $1.25s$
• D. $0.8s$

Answer 1

The correct option is D $0.8s$

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.
The time period is given as the inverse of frequency, that is, $T=\frac{1}{f}=\frac{1}{1.25}=0.8seconds$.
Hence, the time period of a man's heart beat is 0.8 seconds.