1. The Energies of Stationary States( Z2 n2 )
The energy of a stationary state is given by:
En =
-2.18  10-18
(Joules)
“Z” is charge on nucleus.
“n” is stationary state number.
For Hydrogen, n = 4 and Z = 1 ( 12 42 )
E4 =
-2.18  10-18
=  J
For Hydrogen, n = 2 and Z = 1 ( 12 22 )
E2 =
-2.18  10-18
=  J

2. The Energies of Stationary States
E =  J
Greater P.E.
n=3
E =  J
Lesser P.E.
n=2
Energy Changes
n=1
Ee- = Efinal Einitial
Ee- = (-5.45  10-19) - (-1.36  10-19)
Ee- =  J
Energy change is negative since the atom LOST energy as light!

3. The Energies of Stationary States
Energy Changes
Ee- = Efinal Einitial
Ee- = (-5.45  10-19) - (-1.36  10-19)
Ee- =  J
Energy change is negative since the atom LOST energy as light!
Ee- =  J
= - Elight
= h
 = Elight/h
=  /  10-34
= 1014 Hz
 = c / 
= 3.00  108 / 1014
= nm (green line)