A) \[4\times {{10}^{-5}}/{}^\circ C\]
B) \[3\times {{10}^{-5}}/{}^\circ C\]
C) \[2\times {{10}^{-5}}/{}^\circ C\]
D) \[1\times {{10}^{-5}}/{}^\circ C\]
Correct Answer: D
Solution :
Coefficient of superficial expansion of solid is\[2\times {{10}^{-5}}/{}^\circ C\]. Its coefficient of linear expansion\[\alpha =\frac{\beta }{2}=\frac{2\times {{10}^{-5}}}{2}\] \[=1\times {{10}^{-5}}/{}^\circ C\]
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