Which one or more of the following events cannot raise an atom fromits ground state to an excited state?

Question

a. spontaneous emission of a photon
b. induced emission of a photon
c. absorption of a photon
d. a collision with another atom

Answer 1

Absorption of a photon or a collision with another atom can cause an electron to be excited to a higher energy level, but the latter can only occur if the other atom has enough energy and gives enough of it to the struck atom to energize its valence electrons.

When a photon is absorbed, though, its energy is translated into energy for valence electrons, and can raise them to higher states, as demonstrated by the photoelectric effect.

Answer 2

An atom in its ground state cannot spontaneously emit a photon.

Answer 3

a. spontaneous emmission of a photon
when an atom gives off light without being excited, it can't gain energy

Answer 4

d. a collision with another atom

Answer 5

you mean proton..???