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A car moves with a speed of 54 kmh^-1 to...

A car moves with a speed of `54 kmh^-1` towards a cliff. The horn of the car emits sound of frequency 400 Hz at a speed of `335 m s^-1`. (a) Find the wavelength of the sound emitted by the horn in front of the car. (b) Find the wavelength of the wave reflected from the cliff (c) What frequency does a person sitting in the car hear for the reflected sound wave ? (d) How many beats does he hear in 10 seconds between the sound coming directly from the horn and that coming after the reflection ?

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