A) 74.20 cm
B) 74.62 cm
C) 74.92 cm
D) 75.04 cm
Correct Answer: C
Solution :
[c] Suppose the correct barometer height at \[0{}^\circ C\]is \[{{\ell }_{0}}\], then \[{{\ell }_{0}}+\Delta \ell =75\] \[\text{or}\,{{\ell }_{0}}+75\times ({{\alpha }_{Hg}}-{{\alpha }_{b}})\times 27=75\] or \[{{\ell }_{0}}+75\times (0.6\times {{10}^{-4}}-0.2\times {{10}^{-4}})\times 27=75\] \[\therefore \,\,\,\,{{\ell }_{0}}=74.92\,\,cm\]
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