An electron can only be at certain energy levels in a Hydrogen atom. These energy levels are calculated as En=-13.6/n2 eV where n is an integer...

An electron can only be at certain energy levels in a Hydrogen atom. These energy levels are calculated as En=-13.6/n2 eV where n is an integer denoting the energy level. When an electron moves from a higher energy level to a lower energy level, a photon is produced with an energy equal to Ef - Ei where f and i denotes final and initial levels, respectively.

1. The energy of the photon released when an electron moves from energy level 4 to 2 is?

2. The wavelength of the emitted photon is?

(nanometer, 1nm = 10-9m).

1. Is this photon visible to eye (is it in the visible band in the electromagnetic spectrum)? If your answer is yes, enter 1. If your answer is no, enter 0.