CBSE 2024 · Region 5 · Set 1 · Q20 · 2 marks
(a)Two energy levels of an electron in hydrogen atom are separated by $\displaystyle 2.55$ eV . Find the wavelength of radiation emitted when the electron makes transition from the higher energy level to the lower energy level.(b)In which series of hydrogen spectrum this line shall fall ?
(a)
Two energy levels of an electron in hydrogen atom are separated by $\displaystyle 2.55$ eV . Find the wavelength of radiation emitted when the electron makes transition from the higher energy level to the lower energy level.
(b)
In which series of hydrogen spectrum this line shall fall ?
Marking-scheme solution
(a)
$\displaystyle E_{2}-E_{1}=\frac{h c}{\lambda}$
Given $\displaystyle E_{2}-E_{1}=2.55 \times 1.6 \times 10^{-19} \mathrm{~J}$
$\displaystyle \Rightarrow \lambda=\frac{6.63 \times 10^{-34} \times 3 \times 10^{8}}{2.55 \times 1.6 \times 10^{-19}}=487.5 \mathrm{~nm}$
(b)
Balmer series
AtomsThe Line Spectra of the Hydrogen AtomApplyvery_short_answermedium
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CBSE Class 12 Physics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.