The vapours of Hg absorb some electron accelerated by a potential difference of 5.0 V as a result of — Atomic Structure Chemistry Question
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
Answer: B
💡 Solution & Explanation
Energy of the accelerated electron $E = eV = 5.0$ eV. Converting to wavelength: $\lambda = \frac{1240}{E} \text{ nm} = \frac{1240}{5.0} \text{ nm} = 248$ nm. Therefore, correct answer is B.
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