A stationary source emits sound waves of frequency $500Hz$ . Two observers moving along a line passing through the source detect sound to be of frequencies $480Hz$ and $530Hz$ . Their respective speeds are, in $m{s}^{- 1}$ ,
(Given speed of sound $= 300m / s$ )

Question

A stationary source emits sound waves of frequency

500Hz

. Two observers moving along a line passing through the source detect sound to be of frequencies

480Hz

and

530Hz

. Their respective speeds are, in

m{s}^{- 1}

,
(Given speed of sound

= 300m / s

)

Quantrex Academy · Accepted Answer

Correct answer: C. 12, 18

Frequency observed by observer A, f _ A = 500 ( 300 - V _ A 300 ) 480 = 500 ( 300 - V _ A ) 300 V _ A = (1500 - 1440)/(5) = 12m / s Frequency observed by observer B, f _ B = 500 ( 300 + V _ B 300 ) 530 = 500 ( 300 + V _ B 300 ) V _ B = 18m / s

A stationary source emits sound waves of frequency 500Hz . Two...

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