Question

Efficiency of a engine is 0.4 when the temperature of the sink is 300k. What is the temperature of the source
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Answer 1

Answer:

500K

Explanation:

Efficiency is-----

$1 - \frac{t2}{t1}$

0.4 = 1 - 300/x

300/x = 0.6

x = 300/0.6

x = 500K