A) \[111\times {{10}^{-6}}/{}^\circ C\]
B) \[111\times {{10}^{-5}}/{}^\circ C\]
C) \[111\times {{10}^{-4}}/{}^\circ C\]
D) \[111\times {{10}^{-3}}/{}^\circ C\]
Correct Answer: A
Solution :
\[{{d}_{2}}={{d}_{1}}[1-\gamma ({{t}_{2}}-{{t}_{1}})]\] \[7.25=7.5\left( 1-\gamma \times 100 \right)\] \[\therefore \,\,\gamma =\frac{7.5-7.25}{7.5\times 100}=333\times {{10}^{-6}}\] \[\therefore \,\,a=\frac{\gamma }{3}=\frac{333\times {{10}^{-6}}}{3}=111\times {{10}^{-6}}/{}^\circ C\]
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