A Cannot engine takes heat from a reservoir at `627^(@)C` and rejects heat to sink at `27^(@)C`. Its efficiency will be

Options

A. `3//5`
B. `1//3`
C. `2//3`
D. 200/209

Answer

C

Explanation

Efficiency of Carnot engine, `eta = 1 - (T_(2))/(T_(1))`
`eta = 1 - (27+273)/(627+273)=1-(300)/(900)=(600)/(900)=(2)/(3)`.