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+//Example 16.5//
+h=(0.663*10^-33);//J s //Joule-second//Plank's constant
+c=(3.00*10^8);//m/s //meter per second //speed of light
+l=400*10^-9;//nm// wavelength
+a=6.242*10^18;//eV/J //1 Coulomb of charge
+dEb=(h*c)/l     
+mprintf("dEb = %e V",dEb)
+dEb1=dEb*a
+mprintf("\ndEb1 = %f eV  (Answer calculated in the textbook is wrong)",dEb1) 
+l1=700*10^-9;//nm //wavelength
+dEr=(h*c)/l1
+mprintf("\ndEr %e eV",dEr)
+dEr1=dEr*a
+mprintf("\ndEr1= %f eV",dEr1)
+mprintf("\ndelE range: 2.84*10^-19 to 4.97*10^-19J (=1.77 to 4.88 eV)")