Evidence that light has wave property as well as
We talked about the phenomenon represents the
particle property of light in the last report under the title of ‘Photon and
Electron’ on 16 May.
For example, about quintillion RGB photon are
emitted per second from the home lighting lamp. When the blue photons with high
energy collide with object, skin, eyes, the electrons from the surface or
epidermis are emitted. It can be explained through the particle property of
In this report, I demonstrate that the light has
wave property as well as particle property. To do this, let's see what happens
when light passes through a double slit by diffraction and interference.
First, let's briefly discuss diffraction and
Diffraction refers to various phenomena that occur
when a wave encounters an obstacle or a slit. It is defined as the bending of
waves around the corners of an obstacle or through an aperture into the region
of geometrical shadow of the obstacle or aperture.
Interference is a phenomenon
in which two waves superpose to form a resultant wave of greater, lower
Though all wave such as light, sound, and water
wave has the property of diffraction and interference, diffraction and
interference of water wave are easily seen from nature.
Now let's see
what happens when light passes through the double slit. Figure 3 shows what
happens when light passes through a double slit. Since light passed through a
double slit, there must be two patterns, but there are more patterns strangely.
This is because after the light passes through the
double slit, diffraction and interference phenomena happens like the water
waves in the two figures above.
SungSoo Kim Ph.D
* Next week’s topic: Effect of Artificial Lighting on Insects
You can find "Interesting Story about Light Science” series on the link below.