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Atoms — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAtoms1 Mark
Question
Write the second hypothesis of the Bohr Model of hydrogen atom.
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Answer

It states that an electron can revolve only in those orbits for which its angular momentum is an integral multiple of $h / 2 \pi$(i.e.,$m v r=n h / 2 \pi)$.

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