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Standard XII
Physics
Question

A pendulum swings backwards and forwards passing through Y, middle point of the oscillation. The first time of 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 pendulum?
809613_a9bed2f166d245df8c9e6b150ae39d8c.png
  1. T/40
  2. T/21
  3. T/20
  4. T/10

A
T/21
B
T/40
C
T/10
D
T/20
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