Question

During the transition of electron in H atom from any lower to higher orbit the angular momentum cannot be changed by
1 h/2
2 2h
3 3h

Answer 1

because they have a lower and higher we have to use only 1 that's why not charged

Answer 2

During the transition of electrons in the H atom from any lower to a higher orbit, the angular momentum cannot be changed by $\frac{h}{2\pi }$

Explanation:

• The number of orbits of the hydrogen atoms is restricted by limiting the allowed values of angular momentum of the electron.
• In a particle that is moving in a circular orbit there exists angular momentum of the electron which is equal to the mass (m) the times of velocity and v velocity times the radius of the orbit.
• It was assumed by Bohr that the angular momentum of the electron can take certain values which is equal to the n times of Planck's constant divided by $2\pi$  where n is the Planck's constant.
• For an electron transition in a hydrogen atom, the value of angular momentum will change by h/2.