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The siren on an ambulance is emitting a sound whose frequency is 2650 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) Suppose that the ambulance is moving toward you at a speed of 26.6 m/s. Determine the wavelength and the frequency of the sound you hear.

(c) If the ambulance is moving toward you at a speed of 26.6 m/s and you are moving toward it at a speed of 16.0 m/s, find the wavelength and frequency of the sound you hear.

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