An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 34

Question

An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 340Hz. 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 340Hz, higher than 340Hz, or lower than 340Hz. I really suggest drawing a picture to help sort this out.
Higher Lower Same  A car driving East at a speed of 25m/s. The car is behind the ambulance.
Higher Lower Same  A car sitting stationary at the side of the road watching the ambulance moving away.
Higher Lower Same  A car driving East at a speed of 20m/s. The car is in front of the ambulance.
Higher Lower Same  A car driving West at a speed of 15m/s. The car has already passed the ambulance.

*please show work so I can take notes and better understand! :)

Explanation / Answer

Here ,

if ambulance and car are coming closer , car will hear a higher frequency

if ambulance and car is going away , the car will hear a lower frequency

in cases below

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

A car sitting stationary at the side of the road watching the ambulance moving away. -->LOWER

A car driving East at a speed of 20m/s. The car is in front of the ambulance. --> HIGHER

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

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