Oct 26, 2021
Light
-- light is not matter because it has no mass
-- light is a form of electromagnetic radiation
-- travels at a constant speed through space of 3 x 10^8 m/s, or 186,000 mi/s
-- a flash of light made at the equator could travel around the world in 1/7 of a second
-- sound travels more slowly so, for example, you would see a firework before hearing it
-- a photon is a particle of light
-- the amount of energy carried by a photon depends on the wavelength -- violet light has a shorter wavelength than red light -- violet light carries more energy than red light
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