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clear
//
//
//
//Variable declaration
h=6.62*10^-34; //planck's constant(J-sec)
m=9.1*10^-31; //mass of electron(kg)
lamda=3*10^-12; //de-broglie wavelength(m)
e=1.6*10^-19; //charge of electron(c)
//Calculations
E=h^2/(2*m*lamda^2); //energy of electron(J)
E=E/e; //energy of electron(eV)
//Result
printf("\n energy of electron is %0.1f eV",E)
printf("\n answer in the book is wrong")
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