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Physics · 2024 · 2 marks
AtomsDE Broglie’s Explanation of Bohr’s Second Postulate of Quantisation2 marksApplyvery short answer
CBSE 2024 · Region 5 · Set 3 · Q21
The electron in hydrogen atom is revolving with the speed of 2.2 × 10^6 m / s in an orbit of radius 0.53. Calculate the initial frequency of light…
The electron in hydrogen atom is revolving with the speed of $\displaystyle 2.2 \times 10^{6} \mathrm{~m} / \mathrm{s}$ in an orbit of radius $\displaystyle 0.53 \AA$. Calculate the initial frequency of light emitted by the electron using classical physics.
Marking-scheme solution
$\displaystyle \nu=\frac{v}{2 \pi r}$
$\displaystyle \nu=\frac{2.2 \times 10^{6}}{2 \times \pi \times 0.53 \times 10^{-10}}$
$\displaystyle \nu=6.6 \times 10^{15} \mathrm{~Hz}$
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CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.