Question

QUESTION 5 For the following allowed transitions, which photon would have the largest wavelength when an electron moves from one energy level, characterized by the quantum n, to another?

Answer 1

When an electron falls from higher energy state to a lower energy state it emits a photon of energy equivalent to energy gap between the two energy states.

As,. energy of photon, E ∝ 1/λ

Lower the energy of photon higher the wavelength.

Lower the difference between energy states of transition of electron higher the wavelength.

Hence, let electron make transition from n energy syate to :

1. n-1 energy state,.let wavelength of photon is λ1,

2. n-2 energy state, let wavelength of photon is λ2,

Then,

λ1 > λ2.