An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 21

Question

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 210Hz. 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 210Hz, higher than 210Hz, or lower than 210Hz. I really suggest drawing a picture to help sort this out.

A car driving West at a speed of 25m/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 driving East at a speed of 15m/s. The car is ahead of the ambulance.
A car sitting stationary at the side of the road watching the ambulance moving away.

Explanation / Answer

Since you have posted an incomplete question, I think the full question is as below -
1.) A car sitting stationary at the side of the road watching the ambulance move away.

2.) A car driving west at a speed of 15 m/s. The car is moving towards the ambulace.

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

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

A.Same as 210 Hz
B.Lower than 210 Hz
C.Higher than 210 Hz

So, below are my answers -

1) B.Lower than 210 Hz (the distance between them is increasing)
2) C.Higher than 210 Hz (the distance between them is decreasing)
3) A.Same as 210 Hz (no shift)
4) B.Lower than 210 Hz (the distance between them is increasing)

If the question is different, please post the complete question again.

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