Question

When a hydrogen atom absorbs an energy of 10.2 ev the change in its angular momentum is

Answer 1

Given When a hydrogen atom absorbs an energy of 10.2 ev the change in its angular momentum is

Now after absorbing 10.2 ev of energy, the electron goes to its first excited state that is n = 2 from ground state n = 1

Thus change in angular momentum is

L = n h / 2 π

 = 6.6 x 10^-34 / 2 x 3.14 where h is planck's constant

L = 1.05 x 10^-34 J S

So orbital angular momentum of electron in hydrogen atom in nth state is given by 1.05 x 10^-34 J s