A railroad train is travelling at 30 m/s in still air. The frequency of the note emitted by the locomotive whistle is 500 Hz. Speed of sound in air is 344 m/s.
(1) What is the wavelength of the sound waves : (a) in front of the locomotive?
(2) (b) behind the locomotive?
(3) What is the frequency of the sound heard by a stationary listener (c) in front of the locomotive?
(4) (d) behind the locomotive?