- published: 25 Apr 2015
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Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength means a frequency range of roughly 430–750 terahertz (THz).
The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey.
An extra credit assignment for science...how beautiful...
View full lesson: http://ed.ted.com/lessons/light-waves-visible-and-invisible-lucianne-walkowicz Each kind of light has a unique wavelength, but human eyes can only perceive a tiny slice of the full spectrum -- the very narrow range from red to violet. Microwaves, radio waves, x-rays and more are hiding, invisible, just beyond our perception. Lucianne Walkowicz shows us the waves we can't see. Lesson by Lucianne Walkowicz, animation by Pew36 Animation Studios.
Learn about the energy the sun produces and how longer or shorter wavelengths of light gets to Earth and some get send back to space. Visible Spectrum is between 380nm to 700nm. -- Learn about: Wavelength, Light, Ultraviolet, Infrared, Visible Light, Nanometers and more.
This chemistry video tutorial explains the visible light portion of the electromagnetic spectrum. It discusses the wavelength of light in nm that corresponds to the different colors of the rainbow. This video contains plenty of examples and practice problems. Here is a list of topics: 1. Visible Light Spectrum Color Chart Diagram 2. Red Light - 620 to 700 nm in wavelength 3. Blue Light - 450 to 500 nm in wavelength 4. ROYGBIV - Red, Orange, Yellow, Green, Blue, Indigo, and Violet Light 400 to 700 nm Range 5. Relationship between wavelength, frequency and energy 6. Speed of light, wavelength, and frequency equation 7. Energy and Frequency Formula - Planck's Constant 8. nm to m unit conversion - Wavelength 9. Converting Joules to Electron Volts 10. Infrared (IR) and Ultraviolet ...
Mr. Andersen describes visible light while discussing the electromagnetic spectrum. A simple description of the eye, optical illusions and lights are also included. Intro Music Atribution Title: I4dsong_loop_main.wav Artist: CosmicD Link to sound: http://www.freesound.org/people/CosmicD/sounds/72556/ Creative Commons Atribution License
Light is but a small part of a much, much bigger electromagnetic spectrum of radiation that we can’t see. The spectrum includes radio waves, microwaves, infrared light, visible light, ultraviolet, x-rays and gamma rays, but only visible light, which we interpret as colors, can be seen. Different colors are basically light at different frequencies, which travels through space in the form of waves. The closer together these waves are the higher the frequency. Radio waves have the smallest frequency and the biggest wavelength, while gamma rays are the reverse. Hope you enjoy! 5 Insane Facts About Light and Colors 28.11.2014 Subscribe: http://www.youtube.com/subscription_center?add_user=Top5Quantum Facebook: https://www.facebook.com/top5quantum Twitter: https://twitter.com/Top5Quantum G...
The chloroplasts and visible light
STAR GOD™ | 44.44 卐 Beyond Visible Light - Full Documentary | 1080 HD
In the same way that stars are masked by the sky scattering of visible light in daylight many small objects in the atmosphere are also masked.
This is a video compilation of captured UFO footage featured on live news broadcasts in 2016 and years before. The UFO caught on camera is claimed to be proof of intelligent alien life visiting earth. The footage include eye witness encounters/ first hand accounts of fully visible space crafts, lights in the sky and strange occurrences. These UFO caught on video/tape footage cannot be verified and are presented by you the viewer to choose to believe it or not. Please comment, rate and subscribe Thanks for watching! ------------------------------------------------- Copyright Information ------------------------------------------------- All copyrights reversed to their respective holders. No infringement intended, all copyrighted images, trademarks and logos are used under "Fair Use" ...
This video is a discussion of the visible light spectrum. It also includes conversation about various pigments in particular chlorophyll.
Já imaginou se cada lâmpada da sua casa fosse capaz de transmitir dedos, assim como um ponto de acesso WiFi? Aula sobre Visible Light Communication. Links do vídeo: Harald Haas TED: https://www.google.com.br/url?sa=t&rct;=j&q;=&esrc;=s&source;=web&cd;=2&cad;=rja&uact;=8&ved;=0ahUKEwivvvyb46bPAhUCH5AKHTz2DZEQtwIIJjAB&url;=https%3A%2F%2Fwww.ted.com%2Ftalks%2Fharald_haas_a_breakthrough_new_kind_of_wireless_internet%3Flanguage%3Den&usg;=AFQjCNH7iaTOXANSw9rVbCC5LKMAjS4cqg&sig2;=v7GyURNIdN7Ev1snhFgQnQ Disney Visible Light Communication : https://www.disneyresearch.com/project/visible-light-communication/