2 points | Previous Answers SercP9 14.P009 A hammer strikes one end of a thick i

Question

2 points | Previous Answers SercP9 14.P009 A hammer strikes one end of a thick iron rail of length 6.38 m. 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. (The speeds of sound in air and in iron are 343 mVs and 5950 m/s, respectively.) 1 1/ My Not (a) Which pulse reaches the microphone first? the pulse traveling through the iron rail the pulse traveling through the air (b) Find the separation in time between the arrivals of the two pulses.

Explanation / Answer

Viron > Vair

the pulse travelling through iron rail reaches the microphone reaches first

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time taken by pulse through air t1 = d/vair = 6.38/343

time taken by pulse through iron t2 = d/viron = 6.38/5950

seperation in times between the arrivals of the two pulses

dt = t1 - t2

dt = 0.0175 s <<<-----------ANSWER

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