00:01
In this problem, there's actually kind of an interesting problem.
00:04
So we're told that keeping on limitations imposed by the second law of thermodynamics at mind, we want to choose the wrong statement below.
00:11
So which of the statements below is wrong? we're told, again, a heat engine cannot have a thermal efficiency of 100%.
00:21
That is correct because we can't have a low temperature of zero and we can't have a high temperature of infinite.
00:28
So that's correct.
00:31
And then for all reversible processes, the second law efficiency is 100%, or that's kind of by definition what the second law efficiency is measuring how far away from reversible it is.
00:44
Then we said that the second law efficiency of a heat engine cannot be greater than its thermal efficiency.
00:50
All right, well, i don't know about that.
00:52
The second law efficiency of a process is 100 % if no entropy is generated during that process.
01:00
That is also correct because, again, kind of by definition.
01:07
And then the coefficient of performance of a refrigerator can be greater than one...