Rami Arieli: " The
Laser Adventure" Chapter 2.2 page 3
Example 2.1: Visible Spectrum
The visible spectrum wavelength range is: 0.4 - 0.7 micron
[mm] (400-700 [nm]).
The wavelength of the violet light is the
shortest, and the wavelength of the
red light is the longest. Calculate:
a) What is the frequency range
of the visible spectrum.
b) What is the amount of the photon’s energy associated with the violet
light, compared to the photon energy of the red light.
Solution to example 2.1:
The frequency of violet light:
The frequency of red light:
The difference in frequencies:
The energy of a violet photon:
The energy of a red photon:
The difference in energies between the violet photon and the red photon
is:
2.15*10-19 [J]
This example shows how much more energy the violet photon have compared
to the red photon.