#Variable declaration
B= 0.300 #magnetic field, T
Lambda= 450 #wavelength, nm
Lambda= Lambda*(10**(-9)) #converting to m
e= 1.6*(10**(-19)) #charge of an electron, C
Me= 9.1*(10**(-31)) #mass of electron, kg
c= 3 *(10**8) #speed of light, m/s
import math
#Calculation
dLambda= e*B*(Lambda**2)/(4*(math.pi)*Me*c) #m
dLambda= dLambda*(10**9) #converting to nm
#Result
print"The separation between Zeeman components is: ",round(dLambda,5),"nm"