1. A railroad train is traveling at 30 m/s. The locomotive whistle emits a loud tone at frequency 440 Hz.
a) what is the wavelength of the sound waves in front of the locomotive?
b) what is the wavelength of the sound waves behind the locomotive?
c) what is the frequency of the sound heard by a stationary listener in front of the locomotive?
d) what is the frequency of the sound heard by a passenger on a second train that is moving at 15 m/s with respect to the ground, headed toward the first train? (In other words, the train with the whistle is traveling at 30 m/s and the train with the observer is traveling in the opposite direction at 15 m/s. The trains are on parallel tracks, so they won't crash into each other)
e) what is the frequency of the sound heard by the passenger in part (d) after the trains have passed each other?