Question

how frequency is counted . Give example

Answer 1

u mean frequency of a pendulum

well it is calculated by counting numbers of a oscillations in 20 s or 10 s

and then then dividing it with the time

Answer 2

number of oscillation per second is frequency

a source of a wave produces 30 oscillation in 0.3s. what is time period

0.3s_ 30 osc
1s_ 30/0.3 ,multiple 10 on both sides then divide
= 100Hz
T= 1/frequency
= 1/100
=0.01s