quantum physics multiple choice 1) A photon collides with an already excited ato

Question

quantum physics multiple choice

1) A photon collides with an already excited atom, causing the atom to spit out a photon identical to the one that hit the atom. After the collision, there are two identical photons.

Absorption

Spontaneous Emission

Stimulated emission

None of the above

2)  A photon collides with an atom, and the transferred energy excites an atomic electron into a higher energy level.

Absorption

Spontaneous Emission

Stimulated emission

None of the above

3) A photon collides with an already excited atom, causing the atom to spit out a photon identical to the one that hit the atom. After the collision, there are two identical photons.

Absorption

Spontaneous Emission

Stimulated emission

None of the above

Explanation / Answer

1) when an electron moves from higher energy level to lower energy level emission takes place so it should be spontaneous emission

Answer is (b)

2) a photon collides with atom absorption takes place so answer is (a)

3)a photon collides with an already excited atom here also emission takes place

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