Qualities of Light
a) What is Light?
Light, or Visible Light, commonly refers to electromagnetic radiation that can be detected by the human eye. The entire electromagnetic spectrum is extremely broad, ranging from low energy radio waves with wavelengths that are measured in meters, to high energy gamma rays with wavelengths that are less than 1 x 10-11 meters.
b) The 3 most important qualities of any light source?
The three most important qualities of light are brightness, colour, and temperature.
c) What is selective absorption without reflection?
Selective absorption describes the tendency of an object to absorb some frequencies of light more than others. An object that appears a certain colour reflects the light frequency that corresponds to that colour, and it absorbs all the other frequencies in the visible light-spectrum. Absorption of a light wave occurs through resonance. When the frequency of a light wave matches the resonant frequency of an object, then the object vibrates at that frequency. The energy of the light wave stays in that object as thermal or vibrational energy.
Sources - https://andor.oxinst.com/learning/view/article/what-is-light
https://study.com/academy/lesson/color-white-light-reflection-absorption.html
