Question

If the frequency of human heart beat is $1.25Hz$, the number of heart beats in 1 min is

• A. 80
• B. 65
• C. 90
• D. 75
• E. 120

Answer 1

Answer: (D)

The number of beat in
$1s=1.25Hz$
$\therefore$ The number of beat in 1 min
$=1.25\times 60=75$