A student knows that an ambulance siren has actually a frequency of fs = 391 Hz. That measures, when the ambulance is draw close him, the frequency fo = 412 Hz. I think the speed of sound is 343 m/s in this problem. 

Input one expression for the ambulance"s speed, vs, in regards to the frequencies and also the speed of sound v

What is this speed, in meters per second? 

If ambulance is relocating away through the same speed together in component (b), what is the wavelength measured by the student in meters? 


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