The siren of a fire engine that is driving northward at 40.0 m/s emits a sound o

Question

The siren of a fire engine that is driving northward at 40.0 m/s emits a sound of frequency 2200 Hz . A truck in front of this fire engine is moving northward at 17.0 m/s .

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?

Answer is 2520 Hz for this part

Part B

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

I know I'm supposed to divied 343 by the value from part A to get 0.136 m but mastering physics won't accept it!!! please help

Explanation / Answer

Sound can travel in air at approximately 332 metres per second

If subsitute 332 instead of 343,

So

wavelength = 0.1317 m

Otherwise check the Units, wheather in meter or centimeter.

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