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A Carnot refrigeration cycle is used to estimate the energy requirement in an attempt to reduce the temperature of a specimen to absolute zero. Suppose that we wish to remove 0.01 J of energy from the specimen when it is at 2x10-6 K. How much work is necessary if the high-temperature reservoir is at 20 0c?
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Given:
To find:
Work done
Solution:
From given data:
According to Carnot's theroem:
where is the energy discharged to body at higher temperature.
Substituting the given values, we get:
Now work done,
Work done will therefore be
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