ASTR 101 Lecture Notes - Lecture 5: Blueshift, Electromagnetic Spectrum, Rotational Energy
22 Nov 2017
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Document Summary
White light is made up of all of the colours of the rainbow. Interactions between light and matter determine the appearance of everything around us. A mirror reflects light in a particular direction. A movie screen scatters light in all directions. Waves: a wave is pattern of motion that can carry energy without carrying matter along with it. Wavelength: is the distance between two wave peaks. Frequency: the number of times per second that a wave vibrates up and down. A light wave is a vibration of electric and magnetic fields. Light interacts with charged particles through these electric and magnetic fields. Wavelength frequency: wavelength x frequency = speed of light = constant. Each photon of light has a wavelength and a frequency. The energy of a photon depends on its frequency. = wavelength, f = frequency, c = 3. 00 x 108 m/s = speed of light. E = h x f = photon energy.
