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+//chapter 5 example 1//
+clc
+clear
+//band gap energy=Eg,voltage applied=V,total effeciency of an injection laser=nT//
+Eg=1.43;//in ev//
+V=2.5;//in volts//
+nT=0.18;
+ne=((nT*Eg)/V)*100;
+printf("\n external power efficiency=%f percent\n",ne) \ No newline at end of file