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

Question

An ambulance is travelling East at 20 m/s. The siren emits a fixed frequency of 270Hz. Each of the following cars is travelling 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 East at a speed of 20m/s. The car is in front of the ambulance. A car driving West at a speed of 25m/s. The car has already passed the ambulance. A car driving West at a speed of 15m/s. The car has already passed the ambulance. A car sitting stationary at the side of the road watching the ambulance moving away.

Explanation / Answer

1) it will hear at 270 Hz

2)it will hear at less than 270 Hz

3)it will hear at less than 270 Hz

4) it will hear at less than 270 Hz

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