The wavelength of the first spectral line of sodium is \( 5896 \AA \). The first excitation pote....

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The wavelength of the first spectral line of sodium is \( 5896 \AA \). The first excitation potential of sodium
\( \mathrm{P} \)
atom will be \( \left(h=6.63 \times 10^{-34} J s\right) \)
(1) \( 4.2 \mathrm{~V} \)
(2) \( 3.5 \mathrm{~V} \)
(3) \( 2.1 \mathrm{~V} \)
(4) None of these


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