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UT AST 301 - Exam 3 Study Guide

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AST 301 Exam # 3 Study Guide Lesson 1- A black body is a bright object; idealization of a continuous light source- Matter also behaves as a wave- Higher energy corresponds to higher temperature- Higher frequency correlates with bluer light while shorter frequencies go with redlight- Inverse square law: Flux=L/(4pir^2)- Refraction is the bending of light such as from air through class; light moves slower through the flask and light gets bent. This is color dependent; spreads the light out into different colors- Photon is a light particle; a localized swiggle but doesn’t extend on forevero Interaction between light and mattero Photon is a wave packet that carries a certain energy with it; which is proportional to the frequency of the photono Bluer light has higher frequency and more energyo Photoelectric effect: if you shine light upon a metal (or some material), it ejects electrons off. Potassium requires 2 electron energy bolts to eject electrons offLesson 2- Wavelength*frequency=speed- Matter also behaves like a wave- Momentum is linked to wavelength- Most of the mass of an atom is centered in the nucleus- Electrons show more wave like properties than protons and neutrons, if they’re more massive- Light has to correspond in frequency to the energy difference so electron energy can move upward- Absorption is what happens when you take an electron and move it upo Going from n=1 to n=1 takes more electron bolts than from n=6 to n=7- #13Lesson 3- Plank’s law describes characteristic shape of black body- Wien’s law: frequency of maximum radiation increases with temperature- Stefan-Boltzmann law: energy radiated per unit area increases with T^4- Hottest to coolest: blue to red, also in increasing wavelength- Velocity: what component of the actual motion is toward or away from you- If a star is approaching us, it’s blueshifted- If a star is receding, it’s redshifted- Eclipsing binaries: when a star passes in front of another- Brighter stars are more massive stars- As you go to higher, you go to shorter lifetime- Higher mass, higher luminosity, shorter lifetime- More mass=more stuffo Causes the object to be biggero Something is different in the energy production that makes it biggerLesson 4- White dwarf’s: more massive ones, are smaller (Shrinks and becomes very dense) roughly the mass of Sun and size of Eartho The more mass, the smaller volume- Telescopes: how light interacts with mattero We can observe the lighto How we understand everything about astronomyo Make measurements of that lighto Refracting: use lens to focus light Are limited in size and more fragileo Reflecting: use mirrors to focus lighto Typically use CCD cameras to capture the


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UT AST 301 - Exam 3 Study Guide

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