A) \[\frac{C+S-3A}{3}\]
B) \[\frac{C+3A-\operatorname{S}}{3}\]
C) \[\frac{S+3A-C}{3}\]
D) \[\frac{C+\operatorname{S}-\operatorname{A}}{3}\]
Correct Answer: B
Solution :
[b] \[{{\gamma }_{r}}={{\gamma }_{a}}+{{\gamma }_{v}}\]where\[{{\gamma }_{r}}\]= coefficient of real expansion, \[{{\gamma }_{a}}=\]coefficient of apparent expansion and \[{{\gamma }_{v}}=\] coefficient of expansion From copper: \[{{\gamma }_{r}}=C+3{{\alpha }_{cu}}=C+3A\] For silver, \[{{\gamma }_{r}}=S+3{{\alpha }_{Ag}}\] \[\Rightarrow C+3A=S+3{{\alpha }_{Ag}}\Rightarrow \,{{\alpha }_{Ag}}=\frac{C-S+3A}{3}\]
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