The energy levels of an atom is shown in figure. Which one of these… | JEE Main 2023 (25 Jan, Shift 2)

Q28JEE Main 2023 · 25 JAN · SHIFT 2Medium

Energy of the Electron & Energy Levels

The energy levels of an atom is shown in figure.

Which one of these transitions will result in the emission of a photon of wavelength 124.1 nm? Given (h = 6.62 $\times$ 10 ${}^{-34}$ Js)

Show answer and solution

Answer: (d)

Photon energy $E = \frac{hc}{\lambda} = \frac{1240\ \text{eV nm}}{124.1\ \text{nm}} \approx 10\ \text{eV}$ .
From the figure: A $= 2.2$ eV, B $= 5.2$ eV, C $= 3.0$ eV, D $= 0 - (-10.0) = 10.0$ eV.
So the answer is (d) D.

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