Bohr S Model For Hydrogen Atom

The energy of first excitation of sodium is

E%3Dh%20v%3D%5Cfrac%7Bh%20c%7D%7B%5Clambda%7D

where

h

is Plancks constants,

v

is frequency,

c

is speed of light and

%5Clambda

is wavelength.

%5Ctherefore%20E%3D%5Cfrac%7B6.63%20%5Ctimes%2010%5E%7B-34%7D%20%5Ctimes%203%20%5Ctimes%2010%5E%7B8%7D%7D%7B5896%20%5Ctimes%2010%5E%7B-10%7D%7D%20J

E%3D3.37%20%5Ctimes%2010%5E%7B-19%7D%20J

Also, since

1.6%20%5Ctimes%2010%5E%7B-19%7D%20J%3D1%5C%2C%20e%20V

%5Ctherefore%20E%3D%5Cfrac%7B3.37%20%5Ctimes%2010%5E%7B-19%7D%7D%7B1.6%20%5Ctimes%2010%5E%7B-19%7D%7D%20e%20V

E%3D2.1%20%5C%2CeV

Hence, corresponding first excitation potential is

2.1%5C%2C%20V

Chapter Questions
1 MCQs