The coefficient of superficial expansion of a solid 2×10-5/°C. Its coefficient of linear expansion is

Q: The coefficient of superficial expansion of a solid 2×10-5/°C. Its coefficient of linear expansion is

(a) 4×10-5/°C

(b) 3×10-5/°C

(c) 2×10-5/°C

(d) 1×10-5/°C

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Ans: (d)