The first spectral line of sodium atom is 5896 Å. Then the first excitation potential of sodium is -
Text Solution
Verified by ExpertsThe correct answer is:
B
The energy of first excitation of sodium is
Where 
is Planck's constants, 
is frequency, 
is speed of light and 
is wavelength.
Also, since
Hence, corresponding first excitation potential is 2.1 V.
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