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Limit of Resolution

The vapour of...

Question

The vapour of mercury absorbs some electrons accelerated by a potential difference of 4.5 volts as a result of which light is emitted. If the full energy of a single incident electron is supposed to be converted into the emitted by a single mercury atom, find the wave number of the light ?

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Solution

$W a v e n u m b e r, γ = \frac{1}{λ} E = \frac{h c}{λ} γ = \frac{E}{h c}$

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