Posted by **David** on Wednesday, October 9, 2013 at 12:50am.

A police car, whose siren has a natural frequency of 620Hz, moves away from a wall and towards a stationary observer at a speed of 30km/h.

What is the beat frequency perceived by the observer?

If the observer stands between the car and the wall, what beat frequency does he perceive?

## Answer this Question

## Related Questions

- Physics - The siren of a police car produces a sound of frequency 420Hz.A man ...
- physics - a car, moving at 100 mi/hr, passes a stationary police car whose siren...
- physics - 1)As a sound source moves away from a stationary observer, the number ...
- physics - 1)As a sound source moves away from a stationary observer, the number ...
- physical - You are driving along a highway at 27.7 m/s when you hear a siren. ...
- PHYSICS-URGENT HELP - A stationary police car emits a sound of frequency 1200 Hz...
- Physics - Doppler Effect - The siren in an ambulance has a frequency (according ...
- Physics - The frequency of a stationary siren is 1500 Hz when measured by a ...
- physics - 1)As a sound source moves away from a stationary observer, the number ...
- Physics - Waves - A speaker which produces a frequency of 400 Hz is moving away ...

More Related Questions