The ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is
Correct Answer: Option E
If α1 is the linear expansivity of copper
And α2 is the linear expansivity of iron
L1 —> length of copper
L2 —> length of iron
α1L1 = α2L2
L1/L2 = α2/α1
Since α1/α2 = 1.5
α2/α1 = 1/1.5
L1/L2 = 0.67
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