The siren of a fire engine that is driving northward at 35.0 m/s emits a sound of frequency 2120 Hz. A truck in front of this fire engine is moving northward at 17.0 m/s.
 

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Part A What is the frequency of the siren's sound that the fire engine's driver hears reflected from the back of the truck? 2870 Hz O 1570 Hz O 2360 Hz O 2120 Hz Part B What wavelength would this driver measure for these reflected sound waves? O 0.131 m O 0.154 m O 0.162 m O 0.161 m Part A What is the frequency of the siren's sound that the fire engine's driver hears reflected from the back of the truck? 2870 Hz O 1570 Hz O 2360 Hz O 2120 Hz Part B What wavelength would this driver measure for these reflected sound waves? O 0.131 m O 0.154 m O 0.162 m O 0.161 m