An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 28

Question

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 280Hz. Each of the following cars is traveling down the road as described. Determine if the driver of the car will hear a frequency the same as 280Hz, higher than 280Hz, or lower than 280Hz. I really suggest drawing a picture to help sort this out.

A) A car driving East @ speed of 20m/s behind the ambulance.

B) A car driving West @ speed of 25 m/s toward the ambulance.

C) A car driving East @ speed of 15 m/s ahead of the ambulance.

D) A car sitting stationary at the side of the road watching the oncoming ambulance.

Options are: Higher, lower, same

Explanation / Answer

We can use doppler effect to answet these questions.

Observef frequency = f(c+vr)/(c+vs) where vr is speed of receiver and positive if receiver is moving towards the source. vs is speed of source and positive if source is moving away from the receiver.

A) same

B) Higher

C) lower

D) Higher

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