Physicshard · Past Paper
If the amplitude of a sound wave is tripled, the intensity becomes how many times the original?
A3 times
B6 times
C9 times
DNo change
✓ Correct Answer: C — 9 times
Intensity is proportional to the square of the amplitude (I ∝ A^2). If amplitude is tripled, intensity becomes 3^2 = 9 times greater.
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