The figure below shows an energy level diagram for a hydrogen atom, with the electron in the n = 4 level. 
If this atom emitted a photon, what energies could this photon have?
Definitions:
Depression-prone
Refers to individuals who have a higher susceptibility or tendency toward experiencing depression.
Cognitive-behavioral Therapy
A form of psychotherapy that treats problems by modifying dysfunctional emotions, behaviors, and thoughts.
Maladaptive Beliefs
Thoughts or beliefs that are counterproductive or harmful to one’s ability to function effectively.
Systematic Desensitization
A therapy technique used to treat phobias and anxiety by gradually exposing the person to the anxiety source in a controlled environment.
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