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Transcript

How fast is the speed of light in gelatin?

By; Sebastian Johnson

Hypothesis: If I measure the speed of light through gelatin and through an empty container then the speed will show that it slows down as it passes through the gelatin

Materials:

  • One clear plastic container
  • A box of clear jello
  • A protractor
  • A calculator
  • A laser

The data I got from this experiment

shows how fast the speed

of light is going after it

passes through the gelatin.

[Angle of entry] [Angle of refraction] [Refractive Index]

45 degrees 31 degrees 1.373

From this data I have collected, I noticed that the speed of light had slowed down. My calculations show that the speed of light has slowed down 173,000,000 mph in gelatin and that means my hypothesis was correct

because indeed the speed of light slowed down in gelatin.

Question

The reason for me doing this experiment for the Science Fair is to show my peers if the speed of light does change its speed as it passes through the gelatin.

I wanted to figure out how fast the speed of light was slowing down or speeding up in gelatin.

To find the speed of light through gelatin, you must pass a laser through the clear container filled with clear gelatin, and measure the angle of refraction. For my experiment I set up my container at a 45 degree angle and shined the laser through at that angle as well. When I projected the laser the angle of refraction was 31 degrees.

Once you found out what the refractive angle is for the gelatin you must then figure out the refraction index. To calculate the refraction index you must use this equation

Sin(45)/Sin(31)= .7071/.51501 which then converts to the refraction index which is 1.373

Then to find out how fast the speed of light was going through the jello you have to do 1/1.373x(6.71•10 to the power of 8

that then equals 4.89•10 to the power of 8 which equals 498,000,000 mph

Graph

After further analysis, my hypothesis was correct

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