Question

A hydrogen atom inits ground state absorbs 10 of energy. The orbital angular momentum is increased by

Answer 1

The electron is allowed to revolve in certain energy levels in which their angular momentum is an integral multiple of h/2π
.In ground state n=1 ,so the angular momentum is h/2π.If the electron absorbs an energy equal to the difference between two energy level ,it will jumb to higher energy level.So by absorbing a lower amount of energy it can't jump to another energy level ,so it will remain in the same energy level and it's angular momentum also remains the same.

Answer 2

TRICK ; see that 'increased by' in the question

Explanation:

The orbital angular momentum of an electron is given by : n h/2π

By absorbing 10.2 ev , it gets excited to the 2nd orbit

Where the angular momentum = 2h/2π

The increase in momentum = h/2π ( ie 1h/2π is at ground and taking the difference )

The increase in momentum = 6.6 x 10⁻³⁴ / 2 x 3.14

                                               = 1.05 x10⁻³⁴

                          Hope you understand

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