python programs

Example -1.
#wave number, wave length, frequency of spectral lines Balmer series of hydrogen atom
r=1.097e7
n1=2.
n2=input('Enter n2 > 2\n')
n2=float(n2)

wave_number=r*(1/(n1*n1)-1/(n2*n2))
print 'Wave number = ',wave_number

wave_length=1/(wave_number*1e-10)
print 'Wavelength ',wave_length
frequency=3e8/(wave_length*1e-10)
print 'Frequency',frequency

Example- 2.


#radius and energy of the electron in nth orbit of hydrogen atom
import math
e=1.6e-19
m=9.1e-31
h=6.6e-34
es0=8.85e-12
c=3e8
n=input('Enter quantum number =')
radius=n*n*h*h*es0/(math.pi*e*e*m)/1e-10
print 'Radius = ',radius,'A'
energy=-m*e**4/(8*es0*es0*n*n*h*h)/e
print 'Energy = ',energy,'eV'