A car sounding its horn at 480 Hz moves towards a high wall at a speed of$20\ ms^{- 1}$. If the speed of sound is 340$ms^{- 1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closed to

Question

Dr. Abubacker · Accepted Answer

(a) The frequency of reflected sound heard by the girl,
$n^{'} = n\left\lbrack \frac{v - \left( v_{o} \right)}{v - v_{s}} \right\rbrack = n\left\lbrack \frac{v + v_{o}}{v - v_{s}} \right\rbrack$
$= 480\ \left\lbrack \frac{340 + 20}{340 - 20} \right\rbrack = 540\ Hz$

Q. A car sounding its horn at 480 Hz moves towards a high wall at a speed of$20\ ms^{- 1}$. If the speed of sound is 340$ms^{- 1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closed to

Explanation

Reviewed by Dr. Abubacker

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