The vapours of `Hg` absorb some electrons accelerated by a potential difference of `4.5` volt as a result of which ligh

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Q 2642680533.     The vapours of `Hg` absorb some electrons accelerated by a potential difference of `4.5` volt as a result of which light is emitted. If the full energy of single incident `e^-` is supposed to be converted into light emitted by single `Hg` atom, find the wave no. of the light.

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