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In which of the following conditions is a photon emitted?

23. In which of the following conditions is a photon emitted?

1. When an atom or molecule moves from a lower energy state to a higher energy level
2. When an atom or molecule moves from a higher energy state to a lower energy level
3. When an atom or molecule stays in a higher energy state
4. When an atom or molecule moves, it stays at a lower energy level

Answer

The correct answer is: B) When an atom or molecule moves from a higher energy state to a lower energy level

Explanation

A photon is emitted when an atom or molecule moves from a higher energy state to a lower energy state, releasing excess energy in the form of a photon.