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////Given
v=970.6 //A
h=6.63*10**-34 //Js
c=3*10**8 //m/s
e=1.6*10**-19
//Calculation
//
E=((h*c)/(v*e))*10**10
En=-13.6+E
n=sqrt(-13.6/En)
E3=-13.6/(3.0**2)
vmax=(h*c)/((-E3+En)*(1.6*10**-19))
//Result
printf("\n Longest wavelength is %0.0f A",vmax*10**10)
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