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Revisiting Standing Waves

A vehicle mov...

Question

A vehicle moving on a straight road sounds a whistle of frequency 256 Hz while nearing a hill with a velocity 10 ms $^{- 1}$ . The number of beats per second observed by a person travelling in the vehicle is:
( $V = 330 m s^{- 1}$ )

A

zero

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B

10

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C

14

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D

16

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Solution

The correct option is A zero
Beat is the phenomenon that occurs when two waves meet and interfere while traveling along the same medium. In this case the both wave (forward and reflected) wave travel along opposite direction. So there will be no beat.

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