On tripling the absolute temperature of thesource, the efficiency of a Carnot.s heat engine becomes double that of the initial efficiency. Then the initial efficiency of the engine is ________

On tripling the absolute temperature of thesource, the efficiency of a

1.	On tripling the absolute temperature of thesource, the efficiency of a Carnot.s heat engine becomes double that of the initial efficiency. Then the initial efficiency of the engine is ________
Answer» `20%` `50%` `60%` `40%` ANSWER :D