quiz1-practice

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McGill University *

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181

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Physics

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Apr 3, 2024

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pdf

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DRAFT y +1/1/60+ y Practice Quiz Practice Quiz Firstname, lastname, and McGill ID: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Duration : 50 minutes (NOTE: 2023 quiz will have longer duration and some more questions) No documents allowed. The use of any electronic device is forbidden. Question 1 Evaluate the order of magnitude: 0 . 034 × 10 - 1 km / s + 6 . 003 × 10 - 3 km / s 10 - 4 km / s 1 km / h 10 - 3 km / s 10 1 km / h Question 2 Evaluate the order of magnitude: (5 . 64 × 10 - 3 ) / (2 . 3 × 10 6 ) + 10 - 9 10 - 10 10 - 7 10 - 9 10 - 8 Question 3 Give the correct chronological order in which the following scientists made signifi- cant discoveries Gamow, Lemaître, Penzias and Wilson, Guth Guth, Gamow, Lemaître, Penzias and Wilson Lemaître, Guth, Gamow, Penzias and Wilson Lemaître, Gamow, Penzias and Wilson, Guth Question 4 What is the current size of the observable universe (in light years) 10 5 ly 10 ly 10 10 ly 10 15 ly Question 5 Which of the following is a good description of the ‘horizon’ problem? The milky way looks flat when viewed edge-on. Even parts of the universe so distant that light cannot have traveled between them in the age of the universe appear similar. Sunsets are more beautiful when there are many particles to scatter light. It is difficult to see distant stars on the horizon because of parallax. y For your examination, preferably print documents compiled from auto-multiple-choice. y
DRAFT y +1/2/59+ y Question 6 Given the density of matter in the universe ρ c 9 × 10 - 27 kg / m 3 and the radius S obs . = 9 × 10 25 m , what is the expected mass in the visible universe? You can use the formula for the volume V of a sphere with radius r : V = 4 3 πr 3 . 10 50 kg 10 52 g 10 55 g 10 42 kg Question 7 For a planet orbiting a star, what is the direction of its acceleration? Toward the centre (toward the star) Clockwise Counterclockwise Outward (away from the star) Question 8 What is the (order-of-magnitude) size of a large galaxy? 10 3 ly 10 10 ly 10 5 ly 10 ly Question 9 What is the correct chronological order of events? Michelson-Morley experiment, Maxwell’s electromagnetic theory, Planck’s theory of radia- tion, Special relativity Planck’s theory of radiation, Michelson-Morley experiment, Maxwell’s electromagnetic the- ory, Special relativity Maxwell’s electromagnetic theory, Michelson-Morley experiment, Planck’s theory of radia- tion, Special relativity Maxwell’s electromagnetic theory, Special relativity, Michelson-Morley experiment, Planck’s theory of radiation Question 10 Which of the following is true of a transverse wave striking a hard wall? The reflected wave returns with amplitude along the same direction as the incident wave. The reflected wave is reversed in amplitude relative to the incident wave. The reflected wave has the opposite polarization of the incident wave. The reflected wave is more intense than the incident wave. Question 11 Which of the following statements is true (choose only one)? A light-emitting diode is a source of broad-spectrum coherent light. A lightbulb is a source of monochromatic incoherent light A light-emitting diode is a source of monochromatic incoherent light. A laser is a source of incoherent light. y For your examination, preferably print documents compiled from auto-multiple-choice. y
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