Teaching MPPSC Assistant Professor Mock Test Series 2025 Physics Waves Doppler effect

A bus moving with an uniform speed of 72 km/h towards a building blows a horn of frequency 1.7 KHz. If speed of sound in air is 340 m/s, what will be the frequency of echo heard by bus driver ?

1
1.8 KHz
2
2.0 KHz
3
1.6 KHz
4
1.4 KHz
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