The siren of an ambulance wails at 1395 Hz when the ambulance is stationary.What frequency will you hear after this ambulance passes you while traveling at 33.60 m/s? The speed of sound under the prevailing conditions is 343.0 m/s.

Question

Quizplus · Accepted Answer

When the ambulance moves away, the frequency heard is lower due to the Doppler effect. Using the formula for the observed frequency when the source is moving away: $ f' = f \times \frac{v}{v + v_s} $, where $ f = 1395 $ Hz, $ v = 343.0 $ m/s, and $ v_s = 33.60 $ m/s, the observed frequency $ f' $ is approximately 1271 Hz.

The Siren of an Ambulance Wails at 1395 Hz When