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An ambulance with a 200-Hz siren is moving at 30.0 m/s. Take the speed of sound...

An ambulance with a 200-Hz siren is moving at 30.0 m/s. Take the speed of sound to be 340 m/s. a) What frequencies are observed by a stationary person standing on the sidewalk as the ambulance approaches and after it passes? b) Is this Doppler shift real or just a sensory illusion?

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Answer #1

a) Frequency observed by a stationary observer when ambulence approaches to him,

when it passes,

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b) Not its a real phenomena. It happens due to the shift of source towards or away from the observer or vice versa.

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