Question

a source of sound moving towards a stationary observer with a certain velocity passes with the same velocity. the ratio of the Apparent frequencies When the source is moving towards the observer and then moving away from the observer is 7/5 find the velocity of the source of sound ​

Answer 1

Answer:

The velocity of source of sound is 55 m/s

Explanation:

As we know by the Doppler's effect of sound that when source and observer moving relative to each other the frequency observed by the observer is different from actual frequency

So when source is coming closer to the observer then we have

$f_1 = f_0\frac{v}{v - v_s}$

now when source is moving away from the observer then we have

$f_2 = f_0\frac{v}{v + v_s}$

so we will have

$\frac{f_1}{f_2} = \frac{7}{5}$

$\frac{v + v_s}{v - v_s} = \frac{7}{5}$

$5v + 5 v_s = 7v - 7v_s$

$2v = 12 v_s$

$v_s = \frac{v}{6}$

as we know v = 330 m/s[/tex]

so we will have

$v_s = 55 m/s$

#Learn

Topic : Doppler's Effect

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