A) \[2\times {{10}^{-5}}\]
B) \[6\times {{10}^{-5}}\]
C) \[18\times {{10}^{-5}}\]
D) \[1.2\times {{10}^{-5}}\]
E) \[2.1\times {{10}^{-5}}\]
Correct Answer: A
Solution :
\[\Delta V={{V}_{\gamma }}\Delta t\] \[\Rightarrow \] \[0.25=100\times \gamma \times 40\] \[\gamma =\frac{0.24}{100\times 40}\] \[=0.00006\] \[=6\times {{10}^{-5}}\] \[\alpha =\frac{\gamma }{3}\] \[\Rightarrow \] \[\alpha =2\times {{10}^{-5}}/{}^\circ C\]
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