please help me solve this carefully. i have a very hard grader for a teacher. thank you.

Submit: 1. Calculate the energy change and wavelength of light emitted when an electron in a hydrogen atom makes each transition: a) n = 3 + n = 6 b) n = 5n = 1 2. An electron in a hydrogen atom relaxes to the n = 2 level, emitting light with a wavelength of 364.6 nm. What is the value of n for the level in which the electron originated? 3. Which combinations of n and / represent real orbitals and which do not exist? a) 2p b) 3s c) 2d d) 4d 4. For the valid combinations in Problem 3, provide an appropriate sketch of the orbital