The vapours of Hg absorb some electrons accelerated by a potential difference of \( 4.5 \mathrm{...

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The vapours of Hg absorb some electrons accelerated by a potential difference of \( 4.5 \mathrm{eV} \), as a result of which light is emitted. If the full energy of single incident \( \mathrm{e}^{-} \)is supposed to be converted into light emitted by single \( \mathrm{Hg} \) atom, find the wave no. (in \( \mathrm{m}^{-1} \) ) of the light.
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