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In an `e^(-)` transition inside a hydrogen atom, orbital angular momentum may change by (h=planck constant)

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In an `e^(-)` transition inside a hydrogen atom, orbital angular momentum may change by (h=planck constant)
A. `h`
B. `h/pi`
C. `h/(2pi)`
D. `h/(4pi)`
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Correct Answer - B::C
Orbital angular momentum (L) =`n h/(2pi)`
when `n=1, L=h/(2pi)`. When `n=2, L=h/pi`
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