A source of sound S is moving with a velocity | vedclass

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(A) The apparent frequency $n'$ heard by a stationary observer when the source is moving with velocity $v_s$ is given by the Doppler effect formula: $

Vedclass · Accepted Answer

$750$

Vedclass · Answer

(A) The apparent frequency $n'$ heard by a stationary observer when the source is moving with velocity $v_s$ is given by the Doppler effect formula: $n' = n \left( \frac{v}{v \mp v_s} ight)$.When the source is approaching the observer,the apparent frequency is $n_a = n \left( \frac{v}{v - v_s} ight) = 1000 \ Hz$.When the source is moving away from the observer,the apparent frequency is $n_r = n \left( \frac{v}{v + v_s} ight)$.Dividing the two expressions: $\frac{n_a}{n_r} = \frac{v + v_s}{v - v_s}$.Substituting the given values: $\frac{1000}{n_r} = \frac{350 + 50}{350 - 50} = \frac{400}{300} = \frac{4}{3}$.Therefore,$n_r = 1000 	imes \frac{3}{4} = 750 \ Hz$.

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