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+clc

+//Chapter3

+//Ex_13

+//Given

+h=6.6*10^-34 //in J s

+c=3*10^8 //in m/s

+m=9.1*10^-31 //in Kg

+e=1.6*10^-19 // in coulombs

+v=2.1*10^6 // in m/s

+E=m*v^2/2 //in J

+E=E/e // in eV

+E1=-13.6 // in eV

+//change in the energy is E=En-E1

+n=sqrt(-13.6/(E+E1))

+printf(" the electron gets excited to %d level",n)

+n=3

+E3=-13.6/n^2

+delta_E31=E3-E1 // in eV

+delta_E31=delta_E31*e //in J

+lambda_31=h*c/delta_E31

+disp(lambda_31*10^9,"wavelength of emmited radiation from n=3 to n=1 in nm is")

+//Another probability is transition fromm n=3 to n=2

+n=2

+E2=-13.6/n^2

+delta_E32=E3-E2 // in eV

+delta_E32=delta_E32*e // in J

+lambda_32=h*c/delta_E32

+disp(lambda_32*10^9,"wavelength of emmited radiation from n=3 to n=2 in nm is")

+//Another probability is transition fromm n=2 to n=1

+E2=-13.6/n^2

+delta_E21=E2-E1 // in eV

+delta_E21=delta_E21*e // in J

+lambda_21=h*c/delta_E21

+disp(lambda_21*10^9,"wavelength of emmited radiation from n=2 to n=1 in nm is")