Mathematics · Waves and Acoustics
The driver of a bus approaching a vertical wall notices that the frequency of his bus's horn changes from 420 Hz to 490 Hz when he hears it after reflection from the wall. Find the speed of the bus if the speed of sound is 330 m/s.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 171 km/h
- 261 km/h
- 381 km/h
- 491 km/h✓
Correct answer
91 km/h
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