When an electron in hydrogen atom is excited from its fourth to fifth stationary orbit the change in angular momentum of electron is?

When an electron in hydrogen atom is excited from its 3rd to 5th stationary orbit, tbe change in angular momentum of electron is (Planck's constant: h = 6.62 x 10-34 Js) ____________.

• 5.26 x 10-34 Js

• 3.16 x 10-34 Js

• 1.08 x 10-34 Js

• 2.11 x 10-34 Js

When an electron in hydrogen atom is excited from its 3rd to 5th stationary orbit, tbe change in angular momentum of electron is 2.11 x 10-34 Js.

Explanation:

Change in the angular momentum,

`Delta "L" = "L"_2 - "L"_1 = ("n"_2  "h")/(2 pi) - ("n"_1  "h")/(2 pi)`

`therefore Delta "L" = "h"/(2pi) ("n"_2 - "n"_1)`

`= (6.62 xx 10^-34)/(2 xx 3.14) (5 - 3)`

`= 2.11 xx 10^-34  "Js"`

Concept: Bohr’s Atomic Model

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