Two cars A and B are moving away from each other in opposite directions
PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
Two cars A and B are moving away from each other in opposite directions. Both cars move with a speed of 20 m/s-1 with respect to the ground. If an observer in car A detects a frequency 2000 Hz of the sound coming from car B, what is the natural frequency of the sound source in car B? (speed of sound in air = 340 m/s-1)
(1) 2250 Hz
(2) 2060 Hz
(3) 2300 Hz
(4) 2150 Hz