Wavelength is the distance between corresponding points of two consecutive waves and is often expressed in units of metres-for instance, nanometres (1 nm = 10 −9 metre). Frequency, which is the number of waves passing a fixed point in space in a unit of time, is commonly expressed in units of hertz (1 Hz = 1 cycle per second). Any given beam of light has specific values of frequency, wavelength, and energy associated with it. It can be thought of as a stream of minute energy packets radiated at varying frequencies in a wave motion. As a form of electromagnetic radiation, light has properties in common with both waves and particles. To understand colour, therefore, it is necessary to know something about light. Newton demonstrated that colour is a quality of light. Uncover through science what makes black color the way it is and how researchers are developing the real pure version of black See all videos for this article SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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