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In: Physics

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

1. A commuter train passes a passenger platform at a constant speed of 41.7 m/s. The train horn is sounded at its characteristic frequency of 350 Hz.

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

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

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

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