A) \[\frac{C+S-3A}{3}\]
B) \[\frac{C+3A-S}{3}\]
C) \[\frac{S+3A-C}{3}\]
D) \[\frac{C+S+3A}{3}\]
Correct Answer: B
Solution :
\[{{\gamma }_{r}}={{\gamma }_{a}}+{{\gamma }_{v}}\]; where \[{{\gamma }_{r}}=\]coefficient of real expansion, \[{{\gamma }_{a}}=\]coefficient of apparent expansion and \[{{\gamma }_{v}}=\]coefficient of expansion of vessel. For copper \[{{\gamma }_{r}}=C+3\,{{\alpha }_{Cu}}=C+3A\] For silver \[{{\gamma }_{r}}=S+3\,{{\alpha }_{Ag}}\] Þ \[C+3A=S+3{{\alpha }_{Ag}}\] Þ \[{{\alpha }_{Ag}}=\frac{C-S+3A}{3}\]
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