A) \[{{325}^{o}}C\]
B) \[325K\]
C) \[{{39}^{o}}C\]
D) \[{{320}^{o}}C\]
Correct Answer: C
Solution :
Coefficient of performance \[K=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}\Rightarrow 5=\frac{(273-13)}{{{T}_{2}}-(273-13)}=\frac{260}{{{T}_{1}}-260}\] \[\Rightarrow \]\[5{{T}_{1}}-1300=260\Rightarrow 5{{T}_{1}}=1560\] \[\Rightarrow \]\[{{T}_{1}}=312\,K\to 39{{\,}^{o}}C\]
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