Question

* Organizer work, show all work, use units. For these problems, keep 7 significant digits for the frequencies.

On a day with temperature of 33 Celsius, a traffic policeman is using 10.525 GHz frequency aimed with
a radar horn at a car coming towards him at a speed v.

1. What is the sound speed in air in m/s?

2. What is the frequency in terms of v from the radar horn perceived at the coming car?

3. What is the frequency in terms of v that returns from the car to the radar horn?

4. If the beat frequency at radar horn is 5.0858 KHz, what is the speed in mm/s of the car towards the
horn?

Answer 1