10. How long will sound take to travel in (a) an iron rail and (b) air, both 3.3 km in length ? Take speed of sound in air to be 330 m s-1 and in iron to be 5280 m s-1.0
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Answer:
speed of sound in an iron rail = length of rail / speed of sound in iron rail
= 3300 m / 5280 ms^-1
= 0.625 seconds
speed of sound in air = length of air column / speed of sound in air
= 3300 m / 330 ms^-1
= 10 seconds
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