if a heat engine is working between a source of 400k and sink of 300k. find its efficiency
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efficiency (n)=W/Q1
(w=Q1-Q2)
n=Q1-Q2/Q1
n=Q1/Q1-Q2/Q1
n=1-Q2/Q1
n=1-300/400
n=1-3/4
n=4-3/4
n= 1/4
(w=Q1-Q2)
n=Q1-Q2/Q1
n=Q1/Q1-Q2/Q1
n=1-Q2/Q1
n=1-300/400
n=1-3/4
n=4-3/4
n= 1/4
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