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, ![]() ![]() |
Since, ![]() |
So, ![]() |
To obtain 100% efficiency (i.e., ![]() ![]() |
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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