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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...