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Physics 20A Midterm 1 Study Guide

by: Joyce Nguy

Physics 20A Midterm 1 Study Guide Physics 20A

Marketplace > University of California - Irvine > Physics 2 > Physics 20A > Physics 20A Midterm 1 Study Guide
Joyce Nguy
GPA 3.82

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Here are review questions for physics 20A. Happy studying and goodluck!
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This 9 page Study Guide was uploaded by Joyce Nguy on Saturday January 23, 2016. The Study Guide belongs to Physics 20A at University of California - Irvine taught by SMECKER-HANE, T. in Summer 2015. Since its upload, it has received 83 views. For similar materials see INTRO TO ASTRONOMY in Physics 2 at University of California - Irvine.


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Date Created: 01/23/16
1/22/2014 Physics 20A Prof. Tammy Smecker-Hane Week 4 • Exam 1 on Wednesday • Reading for Friday: Ch 7 – The birth and evolution of planetary systems 21st ENTURYASTRONOMY 4th DITION Kay, Palen, Smith & Blumenthal Outline • Exam 1 on Wednesday • 20 Multiple Choice Questions • You must bring the following to the exam: • Scantron Form #F288 (red, half page) • #2 pencil • UCI Student ID Card • Simple Scientific Calculator (no cell phones, no computers, no internet accessible devices, no device that can store more than 6 pieces of information) • Today: Review for Exam 1 • Also practice with StudySpace (Chpt 1 - 5) ©2010 W.W. Norton & Company, Inc. 1 1/22/2014 Problem 1 If the diameter of Venus is 12,000 km, what is the angular diameter of Venus when it is closest to the Earth at a distance of 0.3 AU? A. 1 arcsec B. 1 arcminute θ C. 10 arcsecond D. 10 arcminute ©2010 W.W. Norton & Company, Inc. Problem 2 Where on Earth would you be if you could go out and 12 midnight and see the exact same stars that you saw at 6pm? A. North Pole B. Equator C. Latitude = +30 degrees D. Latitude = +60 degrees ©2010 W.W. Norton & Company, Inc. 2 1/22/2014 Problem 4 If tonight the moon is in the full phase. One week from now, what phase will it be in and when will it rise? Use the diagram below to help answer this question. A. First quarter; rises at 12 midnight B. First quarter phase; rises at 12 noon C. Third quarter; rises at 12 noon D. Third quarter phase; rises at 12 midnight ©2010 W.W. Norton & Company, Inc. Problem 5 The ecliptic is the A. projection of the Earth’s equator on the celestial sphere. B. apparent path of the Sun on the celestial sphere. C. apparent path of the Moon on the celestial sphere. D. projection of the north celestial pole on the zodiac. ©2010 W.W. Norton & Company, Inc. 3 1/22/2014 Problem 6 If an electron bound to a hydrogen atom makes a transition from the n=3 state to the n=2 state and the difference between these energy states is 3 x 10–19J, what also must happen? A photon in the A. red visible region of the spectrum, whose wavelength is 656 nm, is emitted. B. ultraviolet region of the spectrum, whose wavelength is 12 nm, is absorbed. C. infrared region of the spectrum, whose wavelength is 53 mm, is absorbed. D. Radio region of the spectrum, whose wavelength is 14 m, is emitted. ©2010 W.W. Norton & Company, Inc. Problem 7 If star A and star B have the same brightness, but star A is 100 times farther away than star B, how do their luminosities compare? A. Star A is 100 times more luminous that star B. B. Star A is 10,000 times more luminous than star B. C. Star A and star B have the same luminosities. D. Star A is 100 times less luminous than star B. E. Star A is 10,000 times less luminous than star B. ©2010 W.W. Norton & Company, Inc. 4 1/22/2014 Problem 8 When a sunspot erupts on the Sun, the gas released might have a temperature of 1 million K. In what part of the electromagnetic spectrum would this hot gas shine the brightest? Us the EM spectrum shown on the next page to help solve this problem. A. Ultraviolet B. X-ray C. Radio D. Visible ©2010 W.W. Norton & Company, Inc. ©2010 W.W. Norton & Company, Inc. 5 1/22/2014 Problem 9 If Mars orbits the Sun with a semimajor axis of 1.5 AU, what is its orbital period? A. 2 year B. 10 year C. 0.5 year D. 16 year ©2010 W.W. Norton & Company, Inc. Problem 10 If Halley’s comet has a period of 76 years, what is its average distance from the Sun? A. 180 AU B. 78 AU C. 48 AU D. 18 AU ©2010 W.W. Norton & Company, Inc. 6 1/22/2014 Problem 11 You’re late for your exam and driving down the 405 freeway when a CHP officer records a shift of –14 nm when he hits you with a radar gun that operates at λ = 0.1 m. Do you get a ticket? (The speed limit is 65 miles/hr.) ©2010 W.W. Norton & Company, Inc. Problem 12 If you double the temperature of a star, how will its flux change? A. The star’s flux will remain the same. B. The star’s flux will decrease by a factor of 2. C. The star’s flux will increase by a factor of 2. D. The star’s flux will increase by a factor of 16. ©2010 W.W. Norton & Company, Inc. 7 1/22/2014 Problem 13 If you want to double the flux of a light bulb, how much do you have to change the temperature of the filament inside it? A. Raise the temperature by a factor of 1.2 B. Raise the temperature by a factor of 2. C. Raise the temperature by a factor of 12. D. Raise the temperature by a factor of 20. ©2010 W.W. Norton & Company, Inc. Problem 14 Which of the following is TRUE? A. We see the back side of the moon during a new moon phase. B. We see lunar eclipses each month because the Moon’s siderial period is 27 days. C. Solar eclipses only occur when the Moon is in the full phase. D. We never see the back side of the Moon from Earth. ©2010 W.W. Norton & Company, Inc. 8 1/22/2014 Problem 15 Which statement is FALSE? A. Earth is a typical planet in the Solar System. B. The Sun is a typical star in our galaxy. C. The Milky Way is a typical spiral galaxy. D. Our Local Group is a typical small group in the Virgo Supercluster. ©2010 W.W. Norton & Company, Inc. Problem 16 If the Moon is in the full phase then high tide at the beach today will be A. the same as usual because the Moon does not effect the ocean tides. B. the same as usual because the Moon is always approximately the same distance away from the Earth. C. higher up on the beach than usual. D. lower down on the beach than usual. ©2010 W.W. Norton & Company, Inc. 9


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