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Intersection of Sets

A Carnot's en...

Question

A Carnot's engine works as a refrigerator between $250 K$ and $300 K$ . If it receives $750 c a l$ of heat from the reservoir at the lower temperature, the amount of heat rejected at the higher temperature is

A

900 c a l

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B

625 c a l

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C

750 c a l

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D

1000 c a l

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Solution

The correct option is C $900 c a l$
$\frac{750}{W} = \frac{250}{300 - 250}$
Heat rejected $= 750 + 150 = 900 c a l$ .

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