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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
A vibrating tuning fork is moving slowly and uniformly in a horizontal circular path of radius $8\,m$. The shortest distance of an observer in same plane from the tuning fork is $9 \,m$. The distance between the tuning fork and observer at the instant when apparent frequency becomes maximum is ......... $m$
  • A
    $9$
  • B
    $25$
  • ✓
    $15$
  • D
    $\sqrt{353}$
✓

Answer

Correct option: C.
$15$
c
(c)

The apparent frequency is maximum when relative velocity of approach of tuning fork with respect to observer is maximum.

$O P=\sqrt{17^2-8^2}=15 \,m$

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