Energy & Green Tech

Welcome indoors, solar cells

Swedish and Chinese scientists have developed organic solar cells optimized to convert ambient indoor light to electricity. The power they produce is low, but is probably enough to feed the millions of products that the Internet ...

Engineering

Objects can now change colors like a chameleon

The color-changing capabilities of chameleons have long bewildered willing observers. The philosopher Aristotle himself was long mystified by these adaptive creatures. But while humans can't yet camouflage much beyond a green ...

Security

Website rates security of internet-connected devices

If you're in the market for an internet-connected garage door opener, doorbell, thermostat, security camera, yard irrigation system, slow cooker—or even a box of connected light bulbs—a new website can help you understand ...

Hi Tech & Innovation

Sony, Yamaha entertainment cart goes big on monitors, sensors

Sony and Yamaha have collaborated to bring out an autonomous vehicle that goes big on carrying the fruits of Sony's imaging technologies. This vehicle was officially announced as a joint development with Yamaha Motor Co. ...

Energy & Green Tech

The electric vehicle revolution has a visibility problem

Which comes first: the electric vehicle or the charging station? That question has perplexed some experts and officials tasked with nurturing the electrification of transportation in American cities.

Engineering

New technology: Hygienic beer caps

UV light inactivates germs in drinking water. Until now, the disinfection process relied on mercury-vapor lamps, which emit light in the UV spectrum. However, mercury is a heavy metal that affects human health and the environment. ...

page 1 from 16

Light

Light is electromagnetic radiation, particularly radiation of a wavelength that is visible to the human eye (about 400–700 nm, or perhaps 380–750 nm.) In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.

Three primary properties of light are:

Light, which exists in tiny "packets" called photons, exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics.

This text uses material from Wikipedia, licensed under CC BY-SA