Chasing Light

and maybe some heat...


Visible light is a tiny part of the EM spectrum that the naked eye can see. Light waves are the most common form of wave seen and used by humans everyday. Computers, rainbows, typed paper, slightly smaller computers, and walls all use visible light to be seen. Man’s ability to see is a sense that is often overused as compared to the other senses, and only visible light allows people to see.

(<- shown to the left is a picture that can be viewed through visible light) used in many ways

Flashlights, computers, cameras, and light blubs all have different uses of light.

(shown to the right is a light blub that demonstrates a use of visible light ->)

A Visual Explaination of Light

(shown below is a video describing visible light)
Light waves, visible and invisible - Lucianne Walkowicz

Frequency and Wavelengh

On average,

a light wave will be seen in wavelengths from about 390 to 700 nm (Nanometers),

while it will be seen in frequencies from 430 to 790 THz (Terahertz).

The Hollow Flashlight

The hollow flashlight, invented in 2013 by 15-year old Ann Makosinski originally for a google science fair, is able to create light waves without the need for conventional sources of energy such as batteries and electronic charge. Instead, it uses the heat from the human hand in order to create the sufficient energy needed to make light waves.

Using four Peltier tiles, the flashlight is able to produce up to 5.4 mW at 5 foot candles of brightness. The flashlight only needs a five degree temperature difference to work. Harvesting energy by this method can provide a lot of potential for powering other small devices without having to use batteries.

...that other picture

(shown on the right is another image of the hollow flashlight ->)

Article I

(above is a link to an article explaining the invention of the flashlight)

Citations, Citations

"15-year-old Girl Invents Flashlight Powered by the Heat of Your Hand | ExtremeTech." ExtremeTech. Web. 14 Nov. 2014. <>.

"Teen's Bright Idea: Flashlight Powered by Body Heat." TechNewsWorld: All Tech. Web. 18 Nov. 2014. <>.

"Teen Inventor's Bright Idea May Light Up the World - NBC News." NBC News. Web. 14 Nov. 2014. <>.

"Google Science Fair 2013." GSF 2013 : Project : The Hollow Flashlight. Web. 14 Nov. 2014. <>.

"Teenager Invents a Flashlight Powered by the Heat from Your Hand." TreeHugger. Web. 14 Nov. 2014. <>.

"The Frequency of Visible Light." Spectrums. Web. 18 Nov. 2014. <>.

"What Wavelength Goes With a Color?" What Wavelength Goes With a Color? Web. 18 Nov. 2014. <>.