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While out on a call for GERMS, an EMT hears the sound of an ambulance approaching....

While out on a call for GERMS, an EMT hears the sound of an ambulance approaching. The EMT is completely stationary. It is quite an emergency, so the ambulance is approaching at 55 mph and emitting its siren at a frequency of 1200 Hz. (a) What is the frequency heard by the EMT? (b) What is the frequency heard by the hospital away from which the ambulance is moving? (c) What is the frequency of the echo off the hospital heard by the person driving the ambulance? That is, the sound has left the siren, bounced off of the hospital, and returned to the driver in the moving ambulance.

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