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    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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