2.85 x 10-5K-1
1.90 x 10-5K-1
1.86 x 10-5K-1
1.70 x 10-5K-1
1.63 x 10-5K-1
Correct answer is B
\(\alpha\) = \(\frac{\Delta}{3} = \frac{5.7 \times 10^{-5}}{3}\)
= 1.90 x 10-5K-1
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