The vapours of Hg absorb some electron accelerated by a potential difference of 5.0 V as a result of which light is emitted. If the full energy of single incident electron is supposed to be converted

Question

The vapours of Hg absorb some electron accelerated by a potential difference of 5.0 V as a result of which light is emitted. If the full energy of single incident electron is supposed to be converted into light emitted by single Hg-atom, the wavelength of the emitted light is

Prashant Kotian · Accepted Answer

Correct answer: B. E = 5.0 eV. λ = 1240/E = 1240/5.0 = 248 nm.

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