A train is moving at 25 m/s is traveling towards Ms. Andrews, who is standing in the middle of the tracks. What frequency does Ms. Andrews hear if the train has horn frequency of 1000 Hz?

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up