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Q.

The driver of a bus approaching a big wall notices that the frequency of his bus’s horn changes from 420Hz to 490 Hz when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is 330ms−1

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a

91 kmh−1

b

61 kmh−1

c

71 kmh−1

d

81 kmh−1

answer is A.

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Detailed Solution

fa=f0C+VC-V⇒490420=1+V/C1-V/C⇒V=33013 m/s=91.38kmh≈91kmh
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The driver of a bus approaching a big wall notices that the frequency of his bus’s horn changes from 420Hz to 490 Hz when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is 330ms−1