Can someone please help me answer these questions?

1. What is the change in energy (in J) for an electron in a hydrogen atom when it is excited from n=1 to n=5?

2. What is the change in energy (in J) for an electron in a hydrogen atom when it relaxes from n=2 to n=1?

3. Emission of a 1282 nm photon lowers an electron in hydrogen from n=5 to which quantum number, n?

4. Calculate the wavelength, in m, of a photon that is produced when electron in a hydrogen atom drops from n = 6 to n = 4.