Unpolarized light of intensity i0 passes through six successive polaroid sheets each of whose axis makes a 55 ∘ angle with the previous one. part a what is the intensity of the transmitted beam?

The answer to this is decibel

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.