Spectra
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | refers to the apparent brightness of a star and is not a fundamental property of the star. However, the greater the flux, the smaller and more negative the apparent magnitude.
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| Second law of thermodynamics | show 🗑
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| show | Radiate EM ration into space at all wavelengths irrespective of size, shape or composition
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| show | His equation describes the energy flux of BB at a specific wavelength for a specified temperature
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| show | temperature is a measure of heat energy
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| show | T(Kelvin) = T(Centigrade) + 273
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| show | lamdamaxT = 2.8977 x 10^-3. Where lamdamax in meters, T in Kelvin
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| show | Continuous(blackbody) spectra, Emission spectra, Absorption Spectra
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| show | Hot solids, liquids of dense gases. EM radiation produced at all wavelengths
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| show | Hot, low density gas. EM radiation at very specific wavelengths. Hot interstellar gas clouds produce such spectra.
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| show | Produced when light from a continuous spectrum is viewed through a lower density, lower temperature gas. Absorption lines are seen at very specific wavelengths. Stars produce absorption line spectra.
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| show | D4
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| show | Absorption line spectra produced by a blackbody radiator surrounded by a lower temperature gas envelope
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| Photosphere | show 🗑
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| Emission Lines | show 🗑
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| Three processes are at work in Emission lines | show 🗑
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| show | Burst or packet of EM radiation with energy (E = hf)
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| show | Each species of atom has a unique set of absorption/ emission lines
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| show | Classify stars according to their spectral lines(key idea is to use 'strength' of hydrogen lines)
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| show | OB AF G KM
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| OB | show 🗑
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| show | 7500-10,000(A)6000-7500(F) Strongest hydrogen lines(blue-white)
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| G | show 🗑
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| show | 3500-5000(K) <3500(M)Coolest and least luminous stars (red)
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Created by:
davidvachon1
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