Question

When an electron of an atom returns from an excited state to the ground state, it emits energy in the form of a photon. How does the change in energy level compare to the energy of the emitted photon?

a.It is less than the energy of the photon.
b.It is about one third the energy of the photon.
c.It is exactly half of the energy of the photon.
d. It is equal to the energy of the photon.
e.It is exactly twice the energy of the photon.

Answer 1

The letter D is correct because The energy released by the electron in the form of that photon should be equal to the energy of the photon

Answer 2

This goes to the fundamental idea that mass and energy are always conserved, and held at a constant value in the universe. The energy released by the electron in the form of the photon should be equal to the energy of the photon. I believe the answer is D.