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Simple Harmonic Motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsSimple Harmonic Motion1 Mark
MCQ
A pendulum clock keeping correct time is taken to high altitudes:
  • A
    It will keep correct time.
  • B
    Its length should be increased to keep correct time.
  • ✓
    Its length should be decreased to keep correct time.
  • D
    It cannot keep correct time even if the length is changed.
✓

Answer

Correct option: C.
Its length should be decreased to keep correct time.
Time period of pendulum,
$\text{T}=2\pi\sqrt{\frac{\text{l}}{\text{g}}}$
At higher altitudes, the value of acceleration due to gravity decreases.
Therefore, the length of the pendulum should be decreased to compensate for the decrease in the value of acceleration due to gravity.

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