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Question 31216
JEE Physics · Hard

Sound Waves: Intensity MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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IntensityHardQuestion 31216

Question

Power of a speaker is 100 W. Intensity at 100 m assuming uniform spherical radiation:
  1. A
    10⁻³ W/m²
  2. B
    8×10⁻⁴ W/m²
    Correct
  3. C
    0.01 W/m²
  4. D
    0.1 W/m²

Correct answer

8×10⁻⁴ W/m²

Explanation

I = P/(4πr²) = 100/(4π×10⁴) = 100/125664 ≈ 7.96×10⁻⁴ ≈ 8×10⁻⁴ W/m².

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