Wavelength Of Light In The Electromagnetic Spectrum | Science Experiment

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In this experiment, we will be determining the wavelength of light in the electromagnetic spectrum that can pass through the filters. This will determine the efficiency of solar radiation that could be converted into usable and clean electricity.


To determine what wavelength of light in the electromagnetic spectrum can pass through the filters effectively.


We hypothesized that the elimination of some wavelengths using infrared, clear, and colored filters increases the electrical output efficiency of solar cells.


1. 4 Floppy disk

2. 5 Educational solar energy kits of 689 models.

3. 4 Cell Phones

4. Red, blue, and yellow colors

5. Protractor

6. 2 Vernier LabQuest

7. Portable chargers

8. 5 voltage probes

9. A 47 cm long table

10. Notebook

11. Silicon solar cells

12. Two filters


Step 1: Form five panels of silicon solar cells. Each panel is constituted of 4 solar cells.

Step 2: Cover each panel through two different filters from side to side of the cell. Make sure that only certain light will get absorbed by the filters.

Step 3: Wrap the cellphone in the given colors (yellow, blue, and red).

Step 4: Pass the yellow light from the red and blue filters.

Step 5: Make a clear-clear filter as the control of the experiment.

Step 6: Create your experiment so that the floppy disk filter will let only infrared light pass through it, red-yellow will let only blue light pass through it, and the yellow-blue filter will let red light pass through it by reflecting yellow and red light.

Step 7: To measure the conversion of solar energy to electrical energy in volts, wire each of the four panels with different voltage probes.

Step 8: Held this experiment for two hours under 75 degrees Fahrenheit.

Wavelength of Light in the Electromagnetic Spectrum

Step 9: Test each of the panels 32 times. Each time check if the solar panel is working or not.

Step 10: Now, measure the statistical mean of each of the five solar panels 32 times with an interval of one minute.

Step 11: Record your observations.


1. The first panel (A) in which two clear filters were added gave the largest voltage output.

2. The second panel (F), in which red and blue filters were added, was the second-highest voltage giver.

3. The third (B) best filters were yellow and red.

4. The yellow and blue filter (E) was the fourth largest voltage output giver.

5. Panel D had the least voltage output. This panel was covered by an infrared filter and a clear filter.


1. Our hypothesis is invalid due to each solar panel’s thickness and different densities.

2. The exclusion of different radiation decreases the absorption of solar energy, decreasing the electrical efficiency that the solar cell gives an output result.


1. Take the help of your teacher

2. Record the mean value carefully.


In this experiment, we determined whether the efficiency of solar cells increases by excluding certain wavelengths using infrared, colored, and clear filters.

Viva Questions With Answers

Q.1 What was the aim of your experiment?

ANS. We aimed to determine what wavelength of light in the electromagnetic spectrum can pass through the filters effectively. By observing the effect of various filters on the elimination of various wavelengths from solar cells.

Q.2 What was the result of your experiment?

ANS. We found out that the use of filters for excluding wavelengths for increasing electrical efficiency was not right. The exclusion decreases the absorption, which also decreases the electrical output of solar cells.


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