Question

Which of the following sounds can be heard by us?

(1) Sound of a pendulum making 15 oscillations

every second

(2) Sound of a string vibrating 50 times in 5 seconds.

(3) Sound of our heart beating 75 times every minute

(4) Sound of a body vibrating 75 times every second​

Answer 1

Sound of a string vibrating 50 times in 5 seconds