A) prevent radiation
B) find ideal sources
C) reach absolute zero temperature
D) eliminate friction
Correct Answer: C
Solution :
[c] The efficiency of Carnot engine is |
where, is the temperature of the source and that of sink. |
Since, |
So, |
To obtain 100% efficiency (i.e., ), must be zero i.e., if a sink at absolute zero would be available, all the heat taken from the source would have been converted into work. |
The temperature of sink means a negative temperature on the absolute scale at which the efficiency of engine is greater than unity. This would be a violation of the 2nd law of thermodynamics. |
Hence, a negative temperature on the absolute scale is impossible. Hence, we cannot reach absolute zero temperature. |
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