ASTR 1150 Lecture Notes - Lecture 2: Continuous Spectrum, Spectroscopy, Sirius

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14 Jul 2015
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Astr 1150 - lecture 2: the nature of starlight. Light is our best method of studying a star"s characteristics. Light does not require a medium, like sound requires air, to propagte (unlike other waves you might have experience with) The wavelength/frequencyy of a lightwave determines the type or colour. Red light has a longer, more stretched out wavelength than blue light. Since the speed of light is consistent (300,000,000 m/s), the smaller the wavelength, the greater the frequency and vice versa. V= 3. 3x1014 hz ( or 33,000 ghz) Spectroscopy is the science of separating light into its constituent colours using a prism or grating. Where does light come from: hot objects i. The electrons in atoms occupy different engery light i. ii: when electrons drop from a higher engery to a lower energy level, light is emitted. This light has a very specific wavelength and colour.

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