The magnitude of angular momentum, orbit radius and frequency of revolution of electron in hydro...

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The magnitude of angular momentum, orbit radius and frequency of revolution of electron in hydrogen atom corresponding to quantum number \( \mathrm{n} \) are \( \mathrm{L}, \mathrm{r} \) and f respectively. Then according to Bohr's theory of
\( P \) hydrogen atom,
(A) \( \mathrm{fr}^{2} \mathrm{~L} \) is constant for all orbits
(B) frL is constant for all orbits
W.
(C) \( f^{2} \mathrm{rL} \) is constant for all orbits
(D) frL \( ^{2} \) is constant for all orbits
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