Question

A pendulum oscillates 20 times in 4 seconds. Find its time period.
(a) 0.05 sec.
(b) 0.001 sec.
(c) 0.2 sec.
(d) 0.1 sec

Answer 1

Answer:

option:-a

4/20

=0.05

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Answer 2

Given:

No. of oscillations = 20

Time taken to complete 20 oscillations = 4 seconds

To find:

The time period of the given pendulum

Solution:

The time period of a simple pendulum is the time taken by the bob to come back to its initial position after covering a distance of 4X Amplitude of the pendulum.

Since 20 oscillations take 4 seconds,

Using the unitary method we can say that time taken to complete one oscillation = 4/20 s

=0.2 seconds

Hence time period of the pendulum is 0.2 seconds