Light sources
Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not.
3 episodes
Episodes in this category also belong to the following categories:
The Death of Stars
Melvyn Bragg and guests discuss how so much in the Universe, and much of our understanding of it, depends on changes in stars as they die after millions or billions of stable years
9 June 2022
Featuring: Martin Rees, Carolin Crawford, Mark Sullivan
The Life of Stars
Melvyn Bragg discusses the life cycle of stars. They are born among vast swirls of gas and dust and they die in stunning explosions.
27 Mar 2003
Featuring: Paul Murdin, Janna Levin, Phil Charles
The Sun
Melvyn Bragg and his guests discuss the science of the sun, source of all our energy.
10 July 2014
Featuring: Carolin Crawford, Yvonne Elsworth, Louise Harra