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by: Sophie Stella

physnotesweek7.pdf PHYS 104-01

Sophie Stella

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These are the notes for the seventh week of PHYS 104: Astronomy with Dr. Ruch
Dr. Ruch
Class Notes
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This 2 page Class Notes was uploaded by Sophie Stella on Sunday April 3, 2016. The Class Notes belongs to PHYS 104-01 at University of St. Thomas taught by Dr. Ruch in Winter 2016. Since its upload, it has received 24 views. For similar materials see Astronomy in Astronomy at University of St. Thomas.

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Date Created: 04/03/16
PHYS 104: Astronomy Week 7 Course Notes, 3/14 – 3/18 Definitions Spectrum: Achart graphing the intensity vs. the wavelength of a beam of visible light. Thermal Emission: Everything with a temperature emits light. Frequency: The number of periods of a wavelength in a given time. F=v/λ Blackbody: Acurve based on a spectrum graph, but also containing other forms of non-visible light. λmax: Maximum relative wavelength of an object. Imax: Maximum relative intensity of an object. Emission lines: Lines of color in a spectrometer, which show the colors of photons being emitted from an object. IX. Light A. What light can tell us about far away objects: 1. Temperature 2. Size (sometimes) 3. Composition 4. Radial Velocity B. Aspects of light 1. Light behaves both like a wave and like a particle. 2. “Color” refers to the frequency or wavelength of light. 3. Asingle photon (light particle) has a specific wavelength (frequency/color). 4. Intensity is based on the number of photons. a. Temperature intensity determines color C. Wein's Law 1. λmaxT=constant (Lambda max times the Temperature is constant) a. This means we can remotely measure temperature based on the color of an object. 2. Imax=AσT^4 (I max equals theArea times a constant times the Temperature^4) b. This allows us to remotely measure the size, given the intensity and temperature. λmax Imax When the radius increases: constant increases When Temperature increases: decreases increases D. Blackbodies 1. Are perfect absorbers and perfect emitters of light 2. Perfect blackbodies do not exist. • CurveA is hotter • Curve B is bigger • Curves have the same intensity E. Emission lines 1. Each gas has its own unique composition. The colors emitted through a spectrometer are unique to each different composition of gasses. If one looks at the colors emitted by an unknown gas, one would be able to tell the composition.


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