Q. If the frequency of human heart beat is $1.25\ Hz,$ the number of heart beats in 1 minute is
A) 80
B) 65
C) 90
D) 75
Explanation
(d) Beat frequency of heart $= 1.25\ Hz$
$\therefore$ Number of beats in 1 minute $= 1.25 \times 60 = 75$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.