A car moves straight toward a vertical cliff at 2 m s while sounding its horn of…

PHYSICS · Single correct · CBSE · Physics · Waves · Waves

Problem

A car moves straight toward a vertical cliff at 2 m s−1^{-1} while sounding its horn of frequency 400 Hz. The driver hears beats between the direct sound and the sound reflected from the cliff. Taking the speed of sound in air as 340 m s−1^{-1}, the beat frequency heard by the driver is (a) 10 Hz10\,\text{Hz} (b) 8 Hz8\,\text{Hz} (c) 5 Hz5\,\text{Hz} (d) 2 Hz2\,\text{Hz}

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