Question
Medium
Solving time: 3 mins
Even Carnot engine cannot give efficiency, because we cannot
(a) prevent radiation
(b) find ideal sources
(c) reach absolute zero temperature
(d) eliminate friction
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Text solution
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Exp. (c)
The efficiency of Carnot engine is
where, is the temperature of the source and that of sink.
Since,
So,
To obtain 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.
The efficiency of Carnot engine is
where, is the temperature of the source and that of sink.
Since,
So,
To obtain 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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| Question Text | Even Carnot engine cannot give efficiency, because we cannot (a) prevent radiation (b) find ideal sources (c) reach absolute zero temperature (d) eliminate friction |
| Topic | Thermodynamics |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 |
| Upvotes | 86 |
