Part A = f_{o} = 426 Hz

Part B = f_{o} = 377 Hz

While standing near a railroad crossing, you hear a train horn. The frequency emitted by the horn is 400 Hz. If the train is traveling at 75 km/hr and the air temperature is 25 °C, what is the frequency you hear when the train is approaching you?

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Part A = f_{approach} = 302Hz

Part B = f_{recede} = 228Hz

A train is traveling at 30.0 m/s relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 Hz. What frequency f_{approach} is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it?

Part A = traveling away from the listener

Part B = medium (such as air or water)

Part C = traveling toward the source

Part D = medium

Part E = 1/2f_{s}

Part F = 0

Part G = It approaches infinity.

The velocity of the source is positive if the source is ______________. Note that this equation may not use the sign convention you are accustomed to. Think about the physical situation before answering.

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