A bat flies at a steady speed of $4\ ms^{- 1}$ emitting a sound of $f = 90 imes 10^{3}$ Hz. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as defected by the bat will be (take velocity of sound in air as $330\ ms^{- 1}$)

Question

A bat flies at a steady speed of $4\ ms^{- 1}$ emitting a sound of $f = 90 	imes 10^{3}$ Hz. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as defected by the bat will be (take velocity of sound in air as $330\ ms^{- 1}$)

Dr. Abubacker · Accepted Answer

(c) Frequency of reflected sound heard by the bat
$v^{'} = v\left\lbrack \frac{v - \left( v_{o} ight)}{v - v_{s}} ightbrack$
$= v\left\lbrack \frac{v + v_{o}}{v - v_{s}} ightbrack = v\left\lbrack \frac{v + v_{b}}{v - v_{b}} ightbrack$
$= v\left\lbrack \frac{330 + 4}{330 - 4} ightbrack 90 	imes 10^{3}$
$= 92.1 	imes 10^{3}Hz$

Q. A bat flies at a steady speed of $4\ ms^{- 1}$ emitting a sound of $f = 90 \times 10^{3}$ Hz. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as defected by the bat will be (take velocity of sound in air as $330\ ms^{- 1}$)

Explanation

Reviewed by Dr. Abubacker

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