The document summarizes the photon energies of visible light and FM radio frequencies. (1) The range of photon energies in visible light is from 1.6533 eV to 3.2631 eV. (2) The energy of a photon from a typical 100 MHz FM radio station broadcast is 4.136×10-15 eV.

1. 1
The wavelengths of visible light
range from about 380 nm to
about 750 nm. (a) What is the
range of photon energies (in
eV) in visible light? (b) A typical
FM radio station’s broadcast
frequency is about 100 MHz.
What is the energy of an FM
photon of that frequency?
Solution

2. 2
( )
1240 .
380
3.2631 (1)
1240 .
750
1.6533 (2)
From (1) & (2), range of in
visible light is from 1.6533
3.2631 .
a
E hf h
p
c c
hc eV nm
E
nm
eV
hc eV nm
E
nm
eV
E
eV
to eV



  
  
   
  
   
15
15 6
7
( )
4.136 10 . 100
4.136 10 . 100 10
4.136 10
b
E hf
X eV sX MHz
X eV sX X Hz
X eV






