An ambulance is generating a siren sound at a frequency of 2,400 Hz.The velocity of sound is 345.0 m/s.If the ambulance is traveling at a velocity of 24.00 m/s toward the stationary observer,then what is the frequency of the siren perceived by the observer?
A) 2,579 Hz
B) 2,540 Hz
C) 2,525 Hz
D) 2,500 Hz
E) 2,480 Hz

Question

Quizplus · Accepted Answer

The frequency perceived by the observer can be calculated using the Doppler effect formula for sound: f' = f * (v + vo) / (v - vs), where f is the source frequency (2,400 Hz), v is the speed of sound (345 m/s), vo is the observer's velocity (0 m/s, since stationary), and vs is the source velocity (24 m/s). Plugging in the values, f' = 2400 * (345 + 0) / (345 - 24) = 2,579 Hz.

An Ambulance Is Generating a Siren Sound at a Frequency