A train is traveling at 100 ms as it approaches a tunnel in, Ask an Expert

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A train is traveling at 10.0 m/s as it approaches a tunnel in the smooth, vertical face of a rock cliff. The speed of sound is 343 m/s. The engineer sounds a whistle in the locomotive of fundamental frequency 300 Hz.

(a) At what frequency does a rider in the caboose hear the locomotive whistle?

(b) At what frequency des the rider in the caboose har the echo from the cliff wall?

(c) At what frequency would the locomotive whistle be heard by someone standing on the ground near the tracks as the caboose passes?

(d) At what frequency would the bystander hear the echo from the cliff wall?

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