Introduction
In this science experiment, we will examine and study the wavelike properties of light.
Aim
To determine the wavelike properties of light.
Theory
1. Light is electromagnetic radiation that falls under the electromagnetic spectrum, perceived by the human eye.
2. Visible light has a range of wavelengths between 400 and 700 nanometers, falling between the infrared and ultraviolet rays.
3. Light shows dual nature. Wave nature and particle nature.
4. Reflection and refraction show the particle characteristic of light.
5. Interference and photoelectric effect show the wave characteristic of light.
Young Double Slit experiment Poisson Spot
Requirements
1. Laser of 2 Different Wavelengths
2. Rulers
3. Ball Bearings
4. Computer-Generated Slits
5. Microsoft Excel
Procedure
Step 1: Perform several experiments in which the wavelength effect of light can be visible to the naked eye, even after the short wavelengths.
Step 2: Of those experiments, two were significant in developing the wavelike theory of light.
Step 3: For performing this experiment, use lasers of two different wavelengths.
Step 4: To observe the pattern more clearly, perform this experiment over a very long path distance.
Step 5: Take out the image of this pattern.
Step 6: Measure the pattern directly and use photographs.
Step 7: Using MS Excel, analyze the result.
Observations
1. We made our observations from two different classical experiments; Young’s Slit experiment and Poisson’s Spot experiment.
2. In the Young Slit experiment, we used a computer-generated slit and found that the pattern behaved as predicted.
3. We changed the distance between the slits, the distance between the slits and the detection screen, and the light source color for this experiment.
4. In Poisson’s Spot experiment, we created an interference pattern from a laser source using ball bearings that are mounted to glass.
5. Again, for this experiment, we changed the color, ball diameter, and distance between the bearing and detection screen.
6. To obtain an accurate light measurement from two lasers of different wavelengths, I used a steel ruler as a diffraction-reflection grating.
7. Using our knowledge of interference and wavelength, we measured minuscule distances that included spacing on a DVD, CD, and human ear width.
Result
1. We find that light actually exhibits wavelike properties.
2. Light also exhibits particle-like properties.
Precaution
1. Record your observation carefully.
2. Path distance should belong.
3. Images should be taken clearly.
Conclusion
In this way, we explored the wavelike properties of light.
VIVA Questions With Answers
Q.1 What was the aim of your experiment?
ANS. To determine the wavelike properties of light.
Q.2 What do you understand about the Young Slit experiment?
ANS. When light is sent through the vertical slit, it gets diffracted into a pattern on a screen. This is called the Young Slit experiment.
Q.3 What is the result of your experiment?
ANS. We find that light exhibits wavelike properties.
Q.4 How did you make your observation?
ANS. We made our observation from two different classical experiments; Young’s Slit experiment and Poisson’s Spot experiment.
Q.5 What do you understand about Poisson Spot?
ANS. The Poisson spot is the bright point that can be visible at the center of the shadow of the circular object because of Fresnel diffraction.
Saquib Siddiqui is a Mechanical Engineer and a content creator. He has special interest in science experiments and teaches the same to school and college students. He is also a technical lead at RUDE LABS PVT. LTD.
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