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JAMB Physics 2003 Question 24

Question 24

Sound

If the distance from a point source of sound is doubled, by what factor does the intensity decrease?

  1. A.4.00
  2. B.2.00
  3. C.0.50
  4. D.0.25
Show the answer and explanation

Answer: D (0.25)

Explanation

Intensity follows the inverse-square law, I ∝ 1/r2: doubling r makes the intensity (½)2 = 0.25 of its first value.