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Lecture 15 - Strength on spectral lines tell us a star’s...

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Lecture 15 – 10/26/10 What determines if something is a particle or a wave depends on what experiment you do There is a limit to what we can calculate Electron goes up when it takes in a photon and goes down when it emits one Ionization- electron escapes from the force of the nucleus a) Can happen in 2 ways: i) Absorption of photons ii) Collisions Recombination- electron recombines with ion; photons are emitted Continuum spectra- produced by hot material emitting photons a) Thermal wiggling of electron is explained by thermal behavior b) Collisions also take part If our knowledge of light is faulty, then the knowledge of stars is the same a) Atoms produce light We assume that all of the laws of physics is the same everywhere in the universe
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Unformatted text preview: Strength on spectral lines tell us a star’s temperature a) To determine the temperature at two positions on the curve, you have to compare it to another element and take that temperature that aligns both of them Astronomers always want to make a bigger telescope Some light is lost as it passes through a glass lens Astronomical mirrors are curved and the reflection is taking place on the front Two type of telescopes are refracting (uses lens) and reflecting (uses mirror) Reflector telescope are the majority since they can gather as much light as possible...
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