The siren of a police car at rest emits a predominantfrequency of 1600 Hz and the police car is overtaking you from therear, at a speed of 200 km/h. You are proceeding in the samedirection at 50 km/h.
a. what frequency do you hear initially?
b. what frequency will you hear, when the police car passesyou and continues on at 150 km/h after you have slowed to 25 km/hto insure you don't get in the way?