An electron passing through a potential difference of \( 4.9 \mathrm{~V} \) collides with a merc...

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An electron passing through a potential difference of \( 4.9 \mathrm{~V} \) collides with a mercury atom and transfers it to the first excited state. What is the wavelength of a photon corresponding to the transition of the mercury atom to its normal state?
(A) \( 2050 \AA \)
(B) \( 2240 \AA \)
(C) \( 2525 \AA \)
(D) \( 2935 \AA \)
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