Question

A pendulum swings in
backward and forward
direction passing through
Y, the middle point of the
oscillation.
First time the pendulum
passes through Y, a
stopwatch is started.
The twenty-first time the pendulum pass
through Y, the stopwatch is stopped. The
reading is T.
What is the time period of the pendulum?
(A) T/40
(B) T/21
(C) T/20
(D) T/10​

Answer 1

Answer:

D) T/10

Explanation:

The time taken to complete one oscillation is called the time period of a pendulum.

Here the time period is the time taken to move from Y to B then back to A and then to Y.

The reading of stopwatch = T

Number of oscillations = 10

Therefore the answer is T/10

Answer 2

Answer:

(A) T/40

Explanation:

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