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 ......... $m$
Diffcult
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(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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