2025年1月23日 · light pollution, unwanted or excessive artificial light. Like noise pollution, light pollution is a form of waste energy that can cause adverse effects and degrade environmental quality.

2024年12月16日 · Newton demonstrated that colour is a quality of light. To understand colour, therefore, it is necessary to know something about light. As a form of electromagnetic radiation, light has properties in common with both waves and particles.

Overview of various types of electric light, including incandescent, halogen, fluorescent, and LED.

A light-emitting diode (LED) is a semiconductor device that emits visible or infrared light when charged with an electric current. The current causes electrons inside the LED to combine with positive charges and drop to a state of lower energy.

2025年1月16日 · Light energy is the driving force for photosynthesis, the series of chemical reactions in green plants in which carbon dioxide and water form carbohydrates and upon which all life ultimately depends. Insufficient light causes death or retardation of growth in green plants.

One of the most familiar and important forms of energy is light. Nothing is visible to humans when light is totally absent. But light is even more important for other…

Candling, egg-grading process in which the egg is inspected before a penetrating light in a darkened room for signs of fertility, defects, or freshness. First used to check embryo development in eggs being incubated, candling is used in modern commercial egg production primarily to rate quality.

The first electric lighting devices were arc lamps, which had an arc, or band of light, struck between two carbon electrodes. Used to illuminate city streets, these huge, cumbersome lamps were reliable, efficient, and capable of producing a quality of …

2025年1月9日 · Jeff Bezos suggested that we move all heavy industry off Earth and then zone Earth for residences and light industry only. Doing so could reverse some of the effects of climate change while colonizing space.

In reality, Venus flytraps, pitcher plants, and bladderworts aren’t so different from sunflowers or apple trees: their actual “food,” or energy, comes from the Sun. Carnivory doesn’t replace photosynthesis for these plants, which convert light into chemical energy just like their less bug-hungry relatives.