You are driving along a highway at 25.0 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the frequency of the siren? The speed of sound in air is 343 m/s.
A) 1850 Hz
B) 2000 Hz
C) 2050 Hz
D) 2010 Hz
E) 1980 Hz

Question

Quizplus · Accepted Answer

Using the Doppler effect formula for sound, the frequency of the siren can be calculated by averaging the observed frequencies when the vehicle is approaching and receding, considering the speed of sound and the speed of the observer.

You Are Driving Along a Highway at 25