### energy | radiation | light:

Red light
* More red light is absorbed compared to blue.
* Most red light comes from atmospheres
  - earth atmospheres
  - has waves
* RED light occupies the lower, longest wavelength, segment of the visible spectrum.
* allows people to retain their night vision.
* bent by the Earth's atmosphere still reaches the Moon.
* blink in programmable patterns.
* causes a phototropic reaction in some fern prothalliums, though
  - red blood cells to multiply and invigorate of circulation
  - oxygen in the atmosphere, and green light from sodium
* gives off the brightest beam of light because it has the longest wavelength.
* has a higher frequency than blue light.
* has a longer wavelength than blue light
  - almost no affect on our night vision
* has less energy than blue light
  - violet light
* has long wavelengths, blue light has short wavelengths
  - waves whereas blue light has short waves
* has the longest wavelength and travels the shortest water
  - violet the shortest
  - in the visible spectrum and therefore reflects the least
  - that human eyes can see
  - wavelength, is the warmest, and is closest to infrared light
* has the lowest amont of energy and the longext wavelength
  - energy and violet light has the highest energy
  - frequency, blue light has the highest
* helps avoid loss of dark adaption while still providing useful light to work with.
* is absorbed by sea water
  - rapidly in the pond by water molecules and algae
  - best to use for phototherapy
  - diffracted more than blue light
* is emitted by glowing molecules as the air is heated to a plasma by friction
  - hot objects, blue light by cold ones
  - higher frequency than yellow light
* is less affected by absorption within the atmosphere
  - repelling than white light
  - light waves
  - much better than white light, since it affects our night vision the least
  - produced when low-energy solar particles hit the Earth's atmosphere
  - safe for night vision
  - scattered more easily than blue light by dust particles
* is the least energetic and close to infrared and radio on the spectrum
  - color in the visible spectrum and blue is the most active
  - of the colors of visible light, and blue is the most energetic
  - longest wavelength, thus gets absorbed
  - lowest frequency of light and violet is the highest frequency
  - only light to use at a star party
  - preferred illumination at night because it affects night vision the least
  - traffic light
  - transmitted through red glass
  - very low in energy
  - visual signals
* passes through gas and dust more easily than blue light.
* stimulates the red cones, and simultaneously inhibits the surrounding green cones.
* tends to build up on and excite the retina.
* travels Faster than other light
  - slower than blue light
+ Infrared: Physics :: Chemistry
  * The wave is longer than light which humans can see and shorter than microwaves. The word 'infrared' means 'below red'. Red light has the longest wavelength that human eyes can see. Infrared waves cannot be seen by the eye. People sense infrared as heat. Most remote controls use infrared to send the control signals.

Reflection of light
* function of colour only.
* produces the image.

Refraction of light
* is important in the construction and physics of lenses.
* makes a fish appear lower in the water than it really is.

Sconce
* are brackets
  - earthworks
  - fortresses
  - shelter
* is light

Soft light
* is the opposite and comes from a reflected source or a broad source.
* makes skin imperfections and facial shadows less noticeable.
* works like overlay with less intensity while Hard light is more intense.

Solar light
* Some solar light attracts fly insects
* have no smoke or flame, so they are healthier and safer than kerosene and wood.
* use batteries many times as powerful as automobile batteries.