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The siren of a fire engine that is driving northward at 30.0 m/s emits a sound...

The siren of a fire engine that is driving northward at 30.0 m/s emits a sound of frequency 2020 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?

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