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JIPMER 2009
Exam
JIPMER
Year
2009
Subject
Physics
Chapter
Waves and Sound

JIPMER 2009 · Physics · Waves and Sound

A sound absorber attenuates the sound level by 20 dB . The...

A sound absorber attenuates the sound level by 20 dB . The intensity decreases by a factor of

Options

  1. A1000
  2. B10000
  3. C10
  4. D100

Correct answer

D. 100

Step-by-step solution

Let intensity of sound be II and I′I^{\prime} Loudness of sound initially β1=10log⁡(II0)\beta_1=10 \log \left(\frac{I}{I_0}\right) Later, β2=10log⁡(I′I0)\beta_2=10 \log \left(\frac{I^{\prime}}{I_0}\right) Given, β2−β1=20\beta_2-\beta_1=20 ∴20=10log⁡(I′I)\therefore \quad 20=10 \log \left(\frac{I^{\prime}}{I}\right)\therefore \quad I^{\prime}=100 I
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