10 points! Which of the following electron transitions will produce a photon of the longest wavelength in the

Which of the following electron transitions will produce a photon of the longest wavelength in the Bohr hydrogen atom?
A) n = 1 to n = 5
B) n = 4 to n = 1
C) n = 4 to n = 3
D) n = 3 to n = 4
E) n = 4 to n = 2

I put A. I am assuming the atom is going from a ground state to an excited state. I am checking a test I just took, is A correct or not?

A is not right,

What you are looking for is the transition with the lowest energy.
Look at C and D you have a difference of 1 between the n's and C is producing a photon...D is absorbing a photon, so C is the answer.

c