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Q.

If the volume of a block of metal changes by 0.12%. when it is heated through 20°C, then the coefficient of linear expansion is

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a

4×10−5∘C−1

b

2×10−5∘C−1

c

0.5×10−5∘C−1

d

4×10−4∘C−1

answer is B.

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Detailed Solution

Here, ΔVV=0.12%,=0.12100

ΔT=20∘C

Now, γ=ΔVVΔT=0.12100×20=6×10−5∘C−1

∴ α=γ3=2×10−5∘C−1.

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