Physics
Grade-9
Easy

Question

The length of the string of a pendulum is 100 cm, and the pendulum takes 42 s to complete 20 oscillations. What will be its time period?

  1. 2.1 s
  2. 4.2 s
  3. 1.2 s
  4. 2.4 s

Hint:

Time period of a pendulum is the time taken by it to complete one oscillation.

The correct answer is: 2.1 s


    Numbers of oscillations = 42
    Time taken = 20
    Time period of a pendulum is the time taken by it to complete one oscillation.
    So, time period of the given pendulum =
    fraction numerator N u m b e r o f O s c i l l a t i o n s over denominator T i m e space T a k e n space end fraction equals 42 over 20 equals 2.1 space s e c o n d

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