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+//chapter 6 example 4//
+clc
+clear
+//energy gap=Eg,cut off wavelength=lc,plancks constant=h,speed of light=c//
+h=6.62*(10^-34);
+c=3*(10^8);//in mts/sec//
+Eg=1.43*1.6*(10^-19);
+lc=((h*c)/Eg)*(10^6);
+printf("\n cut off wavelength=%f micro meterc\n",lc)
+\ No newline at end of file