A) \[16.8\times {{10}^{6}}J\]
B) \[4\times {{10}^{6}}J\]
C) \[7.6\times {{10}^{6}}J\]
D) \[4.2\times {{10}^{6}}J\]
Correct Answer: A
Solution :
[a] As we know \[\eta =\frac{W}{{{Q}_{1}}}=1-\frac{{{T}_{2}}}{{{T}_{1}}}\] \[\Rightarrow \eta =1-\frac{300K}{1200K}=\frac{3}{4}\] \[\frac{3}{4}=\frac{W}{{{Q}_{1}}}\Rightarrow {{Q}_{1}}=W\times \frac{4}{3}\Rightarrow {{Q}_{1}}=12.6\times {{10}^{6}}\times \frac{4}{3}\] \[{{Q}_{1}}=16.8\times {{10}^{6}}J.\]You need to login to perform this action.
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