Which of the following transitions in a hydrogen atom represent

**absorption**of the

**smallest frequency**photon?

A) n=1 to n=2

b) n= 5 to n =6

C) n= 4 to n=1

**Thought Process :**

Obviously we can eliminate C immediately because Absorption's go "upwards".

So now my dilemma is choosing between A and B ? usually on all these questions the answers have not been so close as they are here, so that's why I am confused since an obvious difference between A and B does not "jump" out at me.

So I know the smallest frequency would be equal to which has the smallest amount of energy which is also equal to which has the smallest gap between the answer choices ( since the bigger the gap the more energy )

--> But A and B are both at a difference of one, so they are both the same small gap apart ?

**----> The answer is B n= 5 to n =6**.... but why ? are smaller numbers that are closer to the number 1, considered Higher Energy or something

**?**