The diagram shows the energy levels for an electron in a certain atom.Of the transitions shown, which represents the emission of a photon with the most energy? 
Definitions:
System 2
A concept from cognitive psychology that refers to the deliberate, analytical, and slow way of thinking, as opposed to quick, instinctual decisions.
Endowment Effect
The tendency for people to value something more highly simply because they own it.
Behavioral Economics
A field of economics that studies how psychological, social, cognitive, and emotional factors affect the economic decisions of individuals and institutions and the consequences for market prices, returns, and resource allocation.
Availability Heuristic
An intellectual simplification employed when the examples readily thought of are used to assess a particular matter, notion, method, or judgement.
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