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practice_exam3-solns

practice_exam3-solns - PHYS 117 General Astronomy Practice...

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PHYS 117 General Astronomy Practice Exam #3 Solutions INSTRUCTIONS: Fill out your personal information on the answer sheet provided. Last name, First & Middle initials, and your M number. USE A PENCIL to mark your answers on the answer sheet. The last page is the math problems; indicate your answers on this last page. SHOW YOUR WORK for partial credit. You must turn in the last page with your answer sheet. Equations you may need: 4 2 4 2 11 4 1 265 , 206 1 26 . 3 1 10 1 1 " 265 , 206 = = = = = × = = o o o T T R R L L T R L p d AU pc ly pc m AU D LD AD σ π ) 10 ( 1 log 5 5 / 10 3 10 5 . 2 5 . 3 10 2 3 3 2 8 yr M M L d M m P a M M a P s m c V V B A AU yr = = + - = - = + = × = τ
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PHYS 117 – General Astronomy Name _______________________ Exam #3 1. A star’s temperature can be determined from its light by using: a. Wien’s Law b. Kepler’s 3 rd Law –gives mass c. Mass-Luminosity relation d. Stefan-Boltzmann Law –gives energy flux 2. The apparent shift, measured in arcseconds, of a star relative to background stars is known as: a. Absolute Magnitude b. Luminosity c. Parallax d. Parsec –This is a distance 3. Rank the densities of stars, from the lowest to highest: a. Neutron star (The densest), Supergiant, Main Sequence, White Dwarf b. Neutron star, White Dwarf, Supergiant, Main Sequence c. Supergiant, Main Sequence, Neutron Star, White Dwarf d. Supergiant, Main Sequence, White Dwarf, Neutron Star
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