2. A hammer strikes one end of a thick iron rail of length 6.70 m. A microphone

Question

2. A hammer strikes one end of a thick iron rail of length 6.70 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 m/s and 5950 m/s, respectively.)

(a) Which pulse reaches the microphone first?

- The pulse traveling through the air

-the pulse traveling through the iron rail

(b)Find the separation in time between the arrivals of the two pulses.

______________s

Explanation / Answer

(a) -the pulse traveling through the iron rail.

(b)the separation in time between the arrivals of the two pulses.

             = 6.70(1/343     - 1/5950)    = 0.0184 s = 18.4 ms

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