A) prevent radiation
B) find ideal sources
C) reach absolute zero temperature
D) eliminate friction
Correct Answer: C
Solution :
The effidency of a Carnot engine is given by \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}\] where \[{{T}_{1}}\] is the temperature of the source and \[{{T}_{2}}\]is the temperature of sink. For 100% efficiency, \[\eta =1\] \[\therefore \] \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}=1\] or \[{{T}_{2}}=0\] But to reach absolute zero temperature is not possible. Therefore, even carnot engine cannot give 100% efficiency.
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