Visible Light

Period 3 By: Georgia, Juliana, Andrea, and Josie

Description of Visible Light

Key facts about Visible light:



  • A Visible light wave is a specific wave that has a form of electromagnetic radiation. Our eyes can only see a small portion of the electromagnetic radiation and that part isnvisible light.
  • These waves are in a broad range of wavelengths called the electromagnetic spectrum. Visible lights falls between the infrared and ultraviolet part of the spectrum.
  • The colors we see in visible light come from how our rods and cones in our eyes view the different types of visible light.


Wavelength- 400- 700 nanometers (nm)


Frequency- 420 terahertz (THz)


Velocity- 299,792.458 kilometers per second (about 186,282.4 miles per second)

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Everyday Applications

Three Different Visible Light Applications

Light Bulbs- Use electricity to emit the visible light out into the atmosphere.


Stars- The cooler stars are the more infrared radiation than visible radiation and the hotter the stars are the more ultraviolet radiation than visible radiation but all of these stars are still visible in the visible part of the spectrum.


Sunlight- Is a mixture of electromagnetic waves in which range from infrared to ultraviolet rays. It also includes visible light, which is in between infrared and ultraviolet rays in the electromagnetic spectrum.

Health Impacts


Negative impacts of exposure to visible light can cause sunburn, skin cancer, sun poisoning and Vitamin D toxicity if exposed for too long. But, if you are exposed for the right amount of time the positive impacts of exposure to visible light can include Vitamin D and enhances kidney function.

Visible light

Video Summary

If the video wouldn't play here is the link: https://www.youtube.com/watch?v=5J8iEIQBlxch


Summary:


The video describes how rainbows are made by Visible light. The purple ray of light bends the most and the red bends the least, all the other colors from purple down start to bend less. Also talks about how the red, blue, and yellow ray of light over lapped can make white light. white light is made by all the colors lined up. The video also discusses TV color theory, how we can see all the colors on TV due to different over lapping of colors from the spectrum.

Interesting Article

Scientist have found that black holes can “burp” up visible light after swallowing stars or gas. This black hole one of the closest black holes to us by about 8,000 light years from Earth. Black holes are known to expel light waves like x rays or radiation. A black hole expelling gas and light is likely to have an affect on the galactic landscape. This is this first time to be documented that there has been visible light expelled instead of radiation from a black hole.