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13 Cards in this Set
- Front
- Back
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Refraction |
Light bends when passing from one media into another |
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Focal Length |
Distance from a telescope lens to the focal point |
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What is the ratio of magnification? |
Magnification= Focal Length of Objective/Focal Length of Eyepiece |
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Frequency range of visible light |
400nm to 700nm |
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The speed of a wave |
C= product of wavelength F= frequency |
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The atmosphere is transparent to only certain wavelengths of light. What types? |
Visible light, infrared, and radio waves |
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Light is a particle; how is this explained? |
1) Thermal radiation spectra 2) The photoelectric effect occurs when light strikes a metal surface and liberates electrons 3) Atomic emissions spectra |
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Matter |
Made up of atoms and molecules |
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Matter |
Made up of atoms and molecules |
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What are the two effects temperature has on thermal radiation? |
1) Hotter objects show greater intensity at all wavelengths, indicating that they emit more total radiation per unit area 2) Hotter objects emit photons with a higher average energy. Peaks of spectra will occur at lower wavelengths for hotter objects |
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Stefan-Boltzmann Law |
J*= emitted power per unit area |
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How to determine spectrum of a star |
1) Surface temperature of the star 2) Power radiated per unit area from the surface of the star 3) The chemical composition of the atmosphere of the star 4) Whether a star is moving towards or away from Earth and at what speed |
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Properties of a telescope that determine the detail they are capable of |
1) Light collecting area determines the amount of illumination in an image 2) The angular resolution is the smallest angle over which two dots can be distinguished from each other |
