Question

Two car approach each other with a common speed of 20 metre per second the first sound of horn and a passenger in other car estimated to be 700 hot the speed of sound is 332 metre per second calculate the actual frequency of the horn when the can move away from each other what is the estimated frequency by the same passenger

Answer 1

Answer:

Actual frequency of the sound is 620.45 Hz and when car moves away from each other then the frequency is 550 Hz

Explanation:

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

So we will have

$f_{ap} = f_o\frac{v + v_o}{v - v_s}$

here we know that

$v_o = v_s = 20 m/s$

$v = 332 m/s$

so we have

$700 = f(\frac{332 + 20}{332 - 20})$

$700 = f\frac{352}{312}$

$f = 620.45 Hz$

Similarly when car moves away from each other then frequency of the sound observed by observer is given as

$f = f_o(\frac{v - v_o}{v + v_s})$

$f = 620.45(\frac{332 - 20}{332 + 20})$

$f = 550 Hz$

#Learn

Topic : Doppler's Effect

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