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Physics · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 3 · Q10
The ratio of the de Broglie wavelengths associated with the electron revolving in the first and third orbits in hydrogen atom is:
The ratio of the de Broglie wavelengths associated with the electron revolving in the first and third orbits in hydrogen atom is :
Official answer
(D)
$\displaystyle \frac{1}{3}$
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.