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JAMB Physics 1979 Question 7

Question 7

Simple Harmonic Motion

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

  1. A.4
  2. B.π/2
  3. C.1/4
  4. D.2π
  5. E.2
Show the answer and explanation

Answer: E (2)

Explanation

T = 2π√(L/g), so T is proportional to √L. Making L four times larger multiplies T by √4 = 2.