The siren of a fire engine that is driving northward at 40.0 m/semits a sound...

The siren of a fire engine that is driving northward at 40.0 m/s emits a sound of frequency 2180 Hz . A truck in front of this fire engine is moving northward at 17.0 m/s .

What is the frequency of the siren's sound that the fire engine's driver hears reflected from the back of the truck?

What wavelength would this driver measure for these reflected sound waves?

Expert Solution

A)

Frequency, f = ((v - vl)/(v - vs)) fs

f = (340 - 17)/(340 - 40)) x 2180 = 2347.13 hz

Required frequency, f = ((340 + 40)/(340 + 17)) x 2347.13 = 2498.35 Hz

B)

Wavelength, lambda = (340 + 40)/2498.35 = 0.152 m

genius_generous answered 2 years ago

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