Boy Phat is sitting in a car, assuming it has a 120 hertz horn, while the car is moving at a speed of 20.0 m/s in still air. If the speed of sound in air is 343 m/s, what frequency will Boy Phat hear when the car approaches and after the car passes? a)What frequency will a stationary person on the track observe as the train approaches and after it passes? b)What frequency was observed by Boy Phat traveling in the car?