Physics
posted by CGUFF .
The energy of the nth excited state of a hydrogen atom is proportional to 100  (100/n2).
1) Using this formula, calculate the energy of the first five energy states.
2) How many spectral lines are possible for the transition of a photon in the n= 5 state to ground?

In the first, put in n=1, calculate, and repeat.
In the second... consider
from n=5 to 1, n=5 to 3, n=3 to 1, and so on.