An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 31

Question

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 310Hz. Each of the following cars is traveling down the road as described. Rank the cars according to the frequency the driver will hear. Select 1 for the car which will hear the highest frequency. Remember that if the frequency is the same, select the same rank and skip the next number. I really suggest drawing a picture to help sort this out. Keep in mind the relative speed - How fast does it seem the ambulance is moving towards or away from each driver? A car sitting stationary at the side of the road watching the oncoming ambulance. A car driving East at a speed of 15m/s. The car is ahead of the ambulance. A car driving East at a speed of 20m/s. The car is in front of the ambulance. A car driving East at a speed of 25m/s. The car is behind the ambulance.

Explanation / Answer

1) .Lower than 310 Hz (the distance between them is increasing)
2) .Higher than 310 Hz (the distance between them is decreasing)
3) .Same as 310 Hz (no shift)
4) .Lower than 310 Hz (the distance between them is increasing)

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