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JIPMER2018PhysicsWaves and Sound

How much intense is 80 dB sound in comparision to 40 dB ?

Options

  1. A10^2
  2. B10^4
  3. C2
  4. D1 2

Correct answer

B. 10^4

Step-by-step solution

B ₁=10 ₁₀ ( I ₁ I ₀ ) and B ₂=10 ₁₀ ( I ₂ I ₀ ) Given, B ₁=80 ~dB , ~B ₂=40 ~dB 80=10 ₁₀ ( I ₁ I ₀ ) or I ₁ I ₀ =10^8 and 40=10 ₁₀ ( I ₂ I ₀ ) or I ₂ I ₀ =10^4 Hence, I ₁ I ₂ =10^4

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