A) find ideal sources
B) prevent radiation
C) eliminate friction
D) reach absolute zero temperature
Correct Answer: D
Solution :
As, efficiency \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}\] \[\eta =1\,\,if\,\,\frac{{{T}_{2}}}{{{T}_{1}}}=0\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,{{T}_{2}}=0\,\,or\,\,{{T}_{1}}=\infty \] Which is not possible.
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