Question

If a pendulum oscillates 5 times in 9 seconds then find its frequency and time period

Answer 1

Given that 40 oscillations are made by the pendulum for 4 sec. So, It makes 10 oscillations are made by the pendulum for 1sec. We know that the number of oscillations made per second (10 oscillations per second ) is called its frequency ∴ Frequency = 10 Hz Time period = 1/ Frequency Time period = 1/ 10 Time period = 0.1 sec

Answer 2

In 1 sec =5/9
Frequency=
$10\pi \div 9$