A) \[\frac{1}{3}\]
B) \[\frac{2}{5}\]
C) \[\frac{3}{4}\]
D) \[\frac{3}{5}\]
Correct Answer: B
Solution :
[b] \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}=1-\frac{300}{500}=\frac{2}{5}\]
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