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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
The sound intensity level at a point $4 \,m$ from the point source is $10 \,dB$, then the sound level at a distance $2 \,m$ from the same source will be ........ $dB$
  • A
    $26$
  • ✓
    $16$
  • C
    $23$
  • D
    $32$
✓

Answer

Correct option: B.
$16$
b
(b)

$I \propto \frac{1}{r^2}$

$\therefore$ If at two $m$ intensity is $I_1$ at $4 \,m$, intensity is $\frac{I_1}{4}$

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