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Physics · 2024 · 2 marks
CBSE 2024 · Region 5 · Set 1 · Q20
(a) Two energy levels of an electron in hydrogen atom are separated by 2.55 eV. Find the wavelength of radiation emitted when the electron makes…
(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
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