An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 25

Question

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 250Hz. 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 250Hz, higher than 250Hz, or lower than 250Hz. I really suggest drawing a picture to help sort this out.

A car driving East at a speed of 25m/s. The car is behind the ambulance.

A car driving West at a speed of 15m/s. The car has already passed the ambulance.

A car driving East at a speed of 20m/s. The car is behind the ambulance.

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

Explanation / Answer

arranging in order from highest to lowest frequency

car drivng west at 15m/s

car sitting stationary   

car driving east at 20 m/s

car driving east at 25m/s

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