Hi, for the following question:
You are standing next to a train track when a train comes towards you at 28m/s sounding its 400Hz horn. What is the frequency you hear? The speed of sound at your location is 332m/s.
A) 472 Hz
B) 400 Hz
C) 338 Hz
D) 474 Hz
I realise that you can rule...
As the title says. Can someone help me with this question? The answer is C but I can't seem to understand why. My thinking is that the integral should be equal to 0, which rules out A and B. Then, looking at D I think it would calculate the area in some cases, but never calculate the integral...