allerySound travels through a steel rail at 5000 m/s. A train signal sent through the rail reaches a distance of 1 km in:
A5 s
B20 s
C0.2 s
D2 s
Answer & Solution
Correct answer: C. 0.2 s
Time = distance / speed = 1000 m / 5000 m/s = 0.2 s.
**So the rail signal arrives much faster than an equivalent through air (which would take 1000/340 ≈ 2.94 s).**
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