Jawabanmu

2014-06-02T07:21:24+07:00
Dik : T1 = 227 C = 500 K
        T2 = 27 C = 300 K
Dit : η.....?
Jawab :
η = {1-(T2/T1)} . 100%
   = {1 - (300/500)} . 100%
  = {1 - (3/5)} . 100%
 = {1-0,6}.100%
  = 0,4 .100%
 = 40%