Question

During the transition of an electron from higher state to lower state, a photon is emitted having energy equal to

• A. the energy difference between the initial and final states.
• B. the energy of the electron in the initial state.
• C. the energy of the electron in the final state.
• D. the sum of energies in the initial and the final states.

Answer 1

The correct option is A the energy difference between the initial and final states.

As per Bohr’s third postulate which states that an electron when makes a transition from one of its specified non-radiating orbits to another of lower energy, a photon is emitted having energy equal to the energy difference between the initial and final states.

$\Rightarrow \Delta E=E_{n_2}-E_{n_1}=h\nu$

Hence, option $\left(A\right)$ is the correct answer.