A car P travelling at 20,ms^{-1} sounds its h | vedclass

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Question

(B) According to the Doppler effect,the observed frequency $f$ is given by the formula:$f = f_0 \left( \frac{c + v_o}{c + v_s} \right)$Where:$f_0 = 40

Vedclass · Accepted Answer

$421$

Vedclass · Answer

(B) According to the Doppler effect,the observed frequency $f$ is given by the formula:$f = f_0 \left( \frac{c + v_o}{c + v_s} ight)$Where:$f_0 = 400\,Hz$ (source frequency)$c = 360\,ms^{-1}$ (velocity of sound)$v_o = 40\,ms^{-1}$ (velocity of the observer,car $Q$,moving towards the source)$v_s = 20\,ms^{-1}$ (velocity of the source,car $P$,moving away from the observer)Substituting the values:$f = 400 \left( \frac{360 + 40}{360 + 20} ight)$$f = 400 \left( \frac{400}{380} ight)$$f = 400 	imes 1.0526$$f \approx 421.05\,Hz$Thus,the frequency heard by the passenger is approximately $421\,Hz$.

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Which of the following statements is false?

$A$ source emits a sound of frequency $400 \ Hz$,but the listener hears it to be $390 \ Hz$. Then:

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