What is the frequency heard by a person driving 60 km/h directly toward a factory whistle (f=800 hz if the air temperature is 0°c?

Hi, thank you for posting your question here at .

This can be solved by using the Doppler Effect equation



where fL = frequency the listener hears
fs = frequency of the source
v = velocity of sound in air
vL = velocity of listener, (+) if moving towards source
vs = velocity of source, 0 if stationary

v as a function of temp is
v = 332 + 0.6T
v = 332 + 0.6(0)
v = 332 m/s

And vL = 60 km/h = 16.67 m/s

Substituting,

If an object is moving or in motion