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Efficiency of Carnot heat engine depends on temperatures of source and sink and also depends on working substance.Efficiency of Carnot cycle, = (Work done) / (Heat supplied) = W / q1From first law of thermodynamics, q = U + W.Since Carnot cycle is a cyclic process, U = 0 i.e. q = W = Heat absorbed by system = q1 – q2where q2 = heat given out to the sink. = (q1 – q2)/ q1 = 1 – q2/q1 .Also, 1 – T2 / T1.Hence, we can say that efficiency of Carnot heat engine is independent of thermal capacity of source or sink.
A point was missed out in above answer that 100% efficiency cannot be achieved in any of the process.But Carnot cycle is a process which can be most efficient.
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