train whistle has a frequency of 500 Hz. The train is moving west at a speed of 30.0 m s−1 and you are stationary on the side of the track. The speed of sound in air is 334 m s−1 . (a) What is the apparent frequency of the train whistle as it approaches you? (b) What is the apparent frequency of the train whistle after it has passed you and is receding? You have an air-horn which also emits a sound with a frequency of 500 Hz. You sound your air horn as the train passes. (c) What is the apparent frequency of your air horn from the train conductors point of view as the train is approaching you
Interference of sound
Seiche
A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.
9.12 A train whistle has a frequency of 500 Hz. The train is moving west at a speed of 30.0 m s−1 and you are stationary on the side of the track. The speed of sound in air is 334 m s−1 .
(a) What is the apparent frequency of the train whistle as it approaches you?
(b) What is the apparent frequency of the train whistle after it has passed you and is receding?
You have an air-horn which also emits a sound with a frequency of 500 Hz. You sound your air horn as the train passes.
(c) What is the apparent frequency of your air horn from the train conductors point of view as the train is approaching you?
(d) What is the apparent frequency of your air horn from the train conductors point of view as the train recedes from you?
You jump in your (very fast) car and start driving west at a speed of 60.0 m s−1 .
(e) What is the apparent frequency of the train whistle while you are still catching up to it?
(f ) What is the apparent frequency of the train whistle after you have passed it?
After you have passed the train you perform a U-turn and head back east at still at 60.0 m s−1 .
(g) What is the apparent frequency of the train whistle while you are approaching it?
(h) What is the apparent frequency of the train whistle after you have passed it?
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