A sound wave of frequency 300Hz is emitted towards an appproaching car. The wave is reflected from the car and then received back at the emitter at a frequency of 315 Hz. If the speed of sound is 240 m/s, what is the velocity of the car?
A sound wave of frequency 300Hz is emitted towards an appproaching car. The wave is reflected from the car and then received back at the emitter at a frequency of 315 Hz. If the speed of sound is 240 m/s, what is the velocity of the car?
If the range rate of the car is , then the recieved frequency will be , where is the speed of sound and is the source frequency, the is because this is a two way doppler.
Now an approaching car has negative range rate, so , where is the car speed.