How To: Find light photons with LEDs & photosensitive paper

Find light photons with LEDs & photosensitive paper

In this video Dr. Carlson demonstrates the properties of light. Light is like a wave and it is also like a particle, which means that it comes in small packets. To demonstrate how we know that light behaves like packets of energy, he uses LED’s in different colors and a sheet of phosphorescent paper. When light with a high enough energy shines on the paper it will cause the paper to glow.

Light comes in many different colors, this is known as the electromagnetic spectrum. Red is low energy light and purple is high energy. When the red light shines on the paper it doesn’t glow; the same happens with the orange, yellow and green. However, blue and purple do have enough energy to cause the paper to glow.

The demonstration proves that all colors below blue do not have high enough energy to activate the paper, even in large quantities, so by this we know that light comes in particle form, in other words photons.

Want to master Microsoft Excel and take your work-from-home job prospects to the next level? Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more.

Buy Now (97% off) >

Our Best Phone Hacks

Gadget Hacks' tips — delivered daily.

Be the First to Comment

Share Your Thoughts

  • Hot
  • Latest