ASTRO-110 Lecture Notes - Lecture 5: Deuterium, Atomic Number, Electromagnetic Spectrum
18 Sep 2020
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Document Summary
A 100 watt light bulb radiates 100 joules of energy every second. Light and matter light in every day life. Power the rate at which energy is used/emitted. It is measured in units called watts. 1 watt = 1 joule per second. Four ways in which light can interact with matter. Emission matter releases energy as light. Absorption matter takes energy from light. Transmission matter allows light to pass through it. Reflection matter bounces light in another direction. The dual nature of light: waves and particles. How are wavelength, frequency, and energy related for photons of light. The many forms of light the electromagnetic spectrum. A vibration of an electromagnetic field through which energy is transported. Light as a wave - f = c. Light as a particle e = hf (photon) A wave is a pattern which is revealed by its interaction with particles. For the wave, its speed: s = f .
