JAMB - Physics (1980 - No. 35)
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
3
1.5
1.32
1
0.67
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
\(\frac{L_1}{L_2}\) = \(\frac{\alpha_1}{1.5\alpha_2}\) (since a1- 1.5\(\alpha_2\))
\(\frac{L_1}{L_2}\) = 0.67
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