the ratio of the linear expansivity of copper to that of iron is approximately 1.5....

JAMB 1980

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

A. 3
B. 1.5
C. 1.32
D. 1
E. 0.67

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Correct Answer: Option E

Explanation

\(\alpha_1\)L₁ = \(\alpha_2\)L₂

\(\frac{L_1}{L_2}\) = \(\frac{\alpha_1}{1.5\alpha_2}\) (since a₁- 1.5\(\alpha_2\))

\(\frac{L_1}{L_2}\) = 0.67

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the ratio of the linear expansivity of copper to that of iron is approximately 1.5....

Correct Answer: Option E

Explanation

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