Answer: C
Solution:
Given,
$\mathrm{T}_{1}=303$
$\mathrm{~T}_{2}=277$
Coefficient of performance
$\beta=\frac{\mathrm{Q}_{2}}{\mathrm{~W}}=\frac{\mathrm{Q}_{2}}{\mathrm{Q}_{1}-\mathrm{Q}_{2}}=\frac{\mathrm{T}_{2}}{\mathrm{~T}_{1}-\mathrm{T}_{2}} \quad\left(\mathrm{Q}_{1}=\mathrm{W}+\mathrm{Q}_{2}\right)$
Substituting the value,
$\frac{Q_{2}}{\mathrm{~W}}=\frac{277}{26}$
$\mathrm{W}=\mathrm{Q}_{2} \frac{26}{277}=\frac{600 \times 4.2 \times 26}{277}$
$=236.5 \mathrm{~J}$