STEPHEN 4.24

1. 1
A hydrogen atom in
an excited state
emits a photon of
wavelength 95 nm.
What are the initial
and final states of
the hydrogen atom?
Solution

2. 2

3. 3
2
1240 .
95
13.05
13.60
n
hc
E hf
eV nm
nm
eV
eV
E
n

 


 
1
2
3
4
5
6
13.6
3.4
1.51
0.85
0.54
0.38
E eV
E eV
E eV
E eV
E eV
E eV
  
 
 
 
 
 

4. 4
0
5
,
13.05 13.60
0.55 0.54
Hence, initial and final states
are 1 & 5
Now
E E eV eV
E eV
n n
  
    
 