A car moving at 126 km/h approaches a factory which sounds a siren of frequency n. To the driver of the car, the frequency of the siren appears to be (Speed of sound in air = 350 m/s) - VgyanHub

Question:

A car moving at 126 km/h approaches a factory which sounds a siren of frequency n. To the driver of the car, the frequency of the siren appears to be (Speed of sound in air = 350 m/s)

Options :

(a) lower by 9.09 %
(b) lower by 10 %
(c) higher by 10 %
(d) higher by 11.11 %

Answer :

(c) higher by 10 %

Answer Steps :

step 1

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