Blocking Ultraviolet Light

by | Sep 12, 2022 | Physics, Experiments

Introduction

In this experiment(Blocking Ultraviolet Light), we will be aiming to compare different sunscreens based on their strengths, ages, and brands under different conditions. With the help of this comparison, we will try to understand the blockage of ultraviolet light and the protection offered by different-different sunglasses and sunscreens.

Aim

To compare various sunscreens based on strengths, ages, and brands under various conditions.

Theory

1. An ultraviolet light-sensitive disk is used for testing the amount of light falling on its surface, according to which it changes its color to blue or red. Changing color completely depends on what kind of ultraviolet light-sensitive disk one is using.

2. We will be performing physics analysis as well as chemical analysis.

3. The change in color of this disk is directly proportional to the amount of sunlight it absorbs.

4. Different brands have different compositions that help in blocking ultraviolet lights.

Requirements

1. Ultraviolet light-sensitive disk

2. Computer

3. A digital camera

4. Notebook

Procedure

Step 1: We took an ultraviolet light-sensitive disk to perform this experiment. This disk will test the amount of sunlight falling on it after passing through a sunglass or a protective surface.

Step 2: In physics analysis, perform a color-related experiment on a computer to measure the blockage of ultraviolet light.

Step 3: With the help of a digital camera, take the images of the control and test groups of the disk.

Step 4: Expose the disk within the test group to know the number of ultraviolet lights. After this, the disk will change its color.

Step 5: Measure the change in color of the ultraviolet light-sensitive disk by measuring the saturation of color.

Step 6: Download a large number of images on the computer and perform a qualitative experiment on them.

Step 7: Evaluate the obtained result concerning the composition that is present in a sunscreen

Step 8: Now, we will do a chemistry-based analysis. This includes the active ingredients of chemicals in the screen, for instance, octocrylene, octyl salicylate, Octyl methoxycinnamate, oxybenzone, octyl dimethyl PABA, homosalate, titanium dioxide, and octisalate.

Step 9: The screen made from these compositions has a significant effect in blocking the ultraviolet lights.

Observation

1. We observed that different brands block different amounts of light.

2. We performed this experiment to answer some of the questions like Is sunscreen effective in blocking UV light as much as t-shirts do? What is the role of brands in blocking UV light? And many others.

Result

1. The combination of standard protection factors and active composition plays a very effective role in blocking UV lights.

2. When deciding which sunscreen you should use in a different environment, remember to take the SPF (Standard Protection Factor) and it’s chemical composition into consideration.

Precaution

1. Record the composition of sunscreen carefully.

2. Take help from your parents or teachers.

Conclusion

In this experiment, we compared different sunscreens to find out which one will be effective in blocking UV lights.

Viva Questions With Answers

Q.1 What was the aim of your experiment?

ANS. We aimed to compare various sunscreens based on strengths, ages, and brands under various conditions.

Q.2 What feature of sunscreen plays a very important role in blocking UV light?

ANS. The combination of standard protection factors and active composition plays a vital role in blocking UV lights.

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