Project cost ($):
It will take an hour to set up the experiment, and an hour to conduct it
The materials required for this science experiment can be purchased at a department store.
Basic safety requirements.
Table of Contents
Light has a dual nature: it has the characteristics of both waveforms and particles. This science project was conducted in order to help us better understand the dual nature of light. This paper explains the double split experiment which is also known as Young's experiment, and how the experiment demonstrates the waveform nature of light.
The double slit experiment will prove that light has the properties of waveforms.
Dual nature of light
Particles, waveform, Young's experiment, interference, quantum mechanics, electromagnetic, photon
The materials required for our project are as follows:
1. Two small slits are made in the middle of the first sheet of cardboard. The cardboard sheets are placed on the newspaper stack before they are cut. This will prevent the table from being damaged. The slit should be 1 mm x 5 mm. The slits are parallel to each other and 5mm apart. Only one slit about 1 mm x 5 mm is made in the middle of the second sheet of cardboard.
2. The experiment is set up as illustrated in figure 1. The light source is placed in front of the cardboard sheet and the whiteboard acting as the screen is placed at the back.
The results seen on the white board screen are shown in figure 2. When light passed through the cardboard with only one slit, it was diffracted. A narrow band of light, which is bright in the center and dim at the sides, was observed.
When the test was repeated using the cardboard sheet with 2 slits, light leaving both the holes were diffracted. The diffracted light from the 2 slits met and "interfered", resulting in the interference pattern of dark and light bands on the whiteboard screen. The pattern on the screen also widened by 3 to 4 times.
The double slit experiment proves the wave properties of light.
Vary the size of the slits. Do the patterns on the screen change?
Double slit experiment - http://en.wikipedia.org/wiki/Double-slit_experiment