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NEET2005PhysicsWaves and SoundActual

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 ~m respectively from the source. The ratio of the intensities of the wave at P and Q is:

Options

  1. A3: 2
  2. B2: 3
  3. C9: 4
  4. D4: 9

Correct answer

C. 9: 4

Step-by-step solution

aligned & d₁=2 ~m ₁ d₂=3 ~m & Intensity 1 ( distance )^2 & I₁ I 2^2 and I₂ 1 3^2 & I₁ I₂ = 9 4 aligned

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