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  3. 1. a commuter train passes a passenger platform at

1. A commuter train passes a passenger platform at a constant speed of 41.7 m/s. The...

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Physics

1. A commuter train passes a passenger platform at a constantspeed of 41.7 m/s. The train horn is sounded at its characteristicfrequency of 350 Hz.

(a) What overall change in frequency is detected by a person onthe platform as the train moves from approaching to receding?(Indicate whether the frequency increases of decreases with thesign of your answer.)
(b) What wavelength is detected by a person on the platform as thetrain approaches?

2. Two small speakers are driven by a common oscillator at 8.55✕ 102 Hz. The speakers face each other and are separatedby d = 1.23 m.

Locate the points along a line joining the two speakers whererelative minima would be expected. (Use v = 343 m/s.Choose one speaker as a reference and enter your answers aspositive distances from this speaker, from smallest to largest.There are 6 boxes. Enter NONE in unused answer boxes.) Unit inm.

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