Answer Happy

You and a few friends decide to conduct a Doppler experiment.
You stand 50 m in front of a parked car and your friend stands 50 m
behind the same parked car. A second friend then honks the horn of
the car.

What similarities and differences will there be in the sound
that is heard by:

You
Your friend behind the car.
Your friend who is in the car honking the horn.


For the second part of your Doppler experiment, your friend
starts driving the car towards you while honking the horn. What
similarities and differences will there be in the sound that is
heard by:

You.
Your friend behind the car.
Your friend who is in the car honking the horn.