A carnot engine absorbs `1000J` of heat energy from a reservoir at `127^(@)C` and rejecs `600J` of heat energy during each cycle. Calculate (i) efficiency of the engine, (ii) temperature of sink, (iii) amount of useful work done per cycle.

Options

A. 20% and `-43^(@)C`
B. 40% and `-33^(@)C`
C. 50% and `-20^(@)C`
D. 70% and `-10^(@)C`

Answer

B

Explanation

`eta=1-(Q_(2))/(Q_(1))=1-(T_("sin k"))/(T_("source"))`