CTET PAPER II 2019 · PYQ · Motion / Pendulum · easy
A pendulum oscillates 30 times in 3 seconds. Choose the correct statement from among the following:
A.It's time period is 10 s and frequency 3Hz.
B.It's time period is 0.1 s and frequency is 10 Hz.✓ Correct
C.It's time period is 10 s and frequency is 0.3 Hz.
D.It's time period is 0.3 s and frequency is 0.3 Hz.
Explanation
Frequency = number of oscillations / time = 30/3 = 10 Hz. Time period = 1/frequency = 1/10 = 0.1 s. So the time period is 0.1 s and frequency is 10 Hz.
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