Q 1164012855.     Efficiency of a heat engine whose sink is at a temperature of `300K` is `40%`. To increase the efficiency to `60%`, keeping the sink temperature constant, the source temperature must be increased by-

EAMCET
A

`750K`

B

`500K`

C

`250K`

D

`1500K`

HINT

Use `eta=1-T_text(sink)/T_(source)`

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