Question

Which of the following sounds can be heard by
us?
(1) Sound of a pendulum making 15 oscillations
in every second
(2) Sound of a string vibrating 50 times in 5
seconds
(3) Sound of our heart beating 75 times in every
minute

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

Answer 1

Answer:

sound of a string vibrating 50 times in 5 seconds

Answer 2

(1) Sound of a pendulum making 15 oscillations in every second