Question

How will the principal quantum number of the electron change for absorption? and for emission?

Answer 1

Principal quantum number,n, describes the energy level on which the orbital resides.

With increase in 'n' value the energy increases.

If an electron excites from lower energy to higher energy then that is absorption. So, the absorption of energy depends on principal quantum number.

Similarly, if an electron jumps from higher energy shell to lower energy shell then that is called emission. Therefore,emission depends on principal quantum number. Higher the difference between the two energy levels, higher will be the absorption or emission energy.