The length of each rail is 10m while constructing the track if the temperature in summer may increase by 15°C the gap that should
be left between two successive rads is a = 12 x 10-70)
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Answer:
1.8e-66 m
means 1.8×10-⁶⁶
or 1.8×(1/10⁶⁶)m is correct answer
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