The diagram shows the variation of air pressure from an alarm siren at particular instant. the speed of sound in the air is 340 m/s.
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The siren of a police car produces a sound of frequency 420Hz.A man
sitting next to the road notices that the pitch of the sound changes as
the car moves towards and then away from him.1- WRITE DOWN THE NAME OF
THE PHENOMENON. 2-ASSUME THAT THE SPEED OF THE SOUND IN AIR IS
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