An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 27

Question

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 270Hz. 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 270Hz, higher than 270Hz, or lower than 270Hz. I really suggest drawing a picture to help sort this out.

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 in front of the ambulance.
A car sitting stationary at the side of the road watching the oncoming ambulance.
A car driving West at a speed of 25m/s. The car is moving towards the ambulance.

Explanation / Answer

1) B.Lower than 270 Hz (the distance between them is increasing)
2) C.Higher than 270 Hz (the distance between them is decreasing)
3) A.Same as 270 Hz (no shift)
4) B.Lower than 270 Hz (the distance between them is increasing)

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