An ambulance is traveling north at 60.3 m/s, approaching a car that is also traveling north at 33.4 m/s. The ambulance driver hears his siren at a frequency of 696 Hz. Ambulance 60.3 m/s 33.4 m/s Car What is the wavelength at any position in front of the ambulance for the sound from the ambulance’s siren? The velocity of sound in air is 343 m/s. Answer in units of m.

0.44999 m

Explanation:

f = Actual wavelength = 696 Hz

v = Speed of sound in air = 343 m/s

= Velocity of observer = 33.4 m/s

= Velocity of source = 60.3 m/s

From Doppler's effect we have

Wavelength is given by

The wavelength at any position in front of the ambulance for the sound from the ambulance’s siren is 0.44999 m.

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