The siren on an ambulance is emitting a sound whose frequency is 2350 Hz. The speed of sound is 343 m/s. (a) if the ambulance is stationary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear? (b) Assume that the ambulance is moving toward you at a speed of 26.2 m/s. Decide the wavelength and the frequency of the sound you hear. (c) If the ambulance is moving toward you at a speed of 26.2 m/s and you are moving toward it at a speed of 13.0 m/s, discover the wavelength and frequency of the sound you hear.