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clear
//
//
//
//Variable declaration
L=1*10**-10 //length(m)
n3=3
m=9.11*10**-31 //mass(kg)
e=1.6*10**-19 //charge(c)
h=6.63*10**-34 //plank constant
//Calculation
E1=h**2/(8*m*e*L**2) //g state energy(eV)
E3=n3**2*E1 //energy of 2nd excited state(eV)
E=E3-E1 //energy required to pump an electron(eV)
//Result
printf("\n ground state energy is %0.3f eV",E1)
printf("\n energy of 2nd excited state is %0.2f eV",E3)
printf("\n energy required to pump an electron is %0.2f eV",E)
printf("\n answer given in the book is wrong")
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