A hammer strikes one end of a thick iron rail of length 85m, Physics

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A hammer strikes one end of a thick iron rail of length 85m

A hammer strikes one end of a thick iron rail of length 8.5m. A microphone located at the opposite end of the rail detects two pulses of sound, one that travels through the air and a longitudinal wave that travels through the rail.

a) Which oulse reaches the microphone first?
b) Find the separation in time between the arrivals of the two pulses.

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Physics: A hammer strikes one end of a thick iron rail of length 85m

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Physics: A hammer strikes one end of a thick iron rail of length 85m

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