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JEE Mains · Physics · STD 11 - 14. waves and sound

એક નાનું સ્પીકર \(2\, W\) નું અવાજ આઉટપુટ આપે છે.સ્પીકરથી કેટલા ... \(cm\) અંતરે અવાજની તીવ્રતા \(120\, dB\) નોંધાશે? [સંદર્ભ અવાજની આવૃતિ \(10^{-12}\,W/m^2\) છે]

  1. A \(30\)
  2. B \(10\)
  3. C \(40\)
  4. D \(20\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(40\)

Step-by-step Solution

Detailed explanation

Loudness of sound is given by \(\mathrm{dB}=10 \log \frac{I}{\mathrm{I}_{0}}\) (\(I\) is intensity of sound, \(I_0\) is reference intensity of sound) \(120=10 \log \left(\frac{I}{I_{0}}\right)\) \(\Rightarrow I=1 \mathrm{W} / \mathrm{m}^{2}\) Also,…
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