TB_chapter26 - Chapter 26 Relativity CHAPTER 26 Conceptual...

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Chapter 26, Relativity C HAPTER 26 Conceptual Questions C1. A spaceship is moving away from an observer at relativistic speed. Its length at rest is 100 m, but the observer measures its length as 50 m. A time interval of 100 s on the spaceship would be measured by the observer to be which of the following? a. 50 s b. 100 s c. 150 s d. 200 s C2. A spaceship, which has length 50 m and width 10 m when at rest, is moving in a direction along its length at a speed where its length contraction results in a 40-m length measured by a stationary observer. What would the measured width be in this case? a. between 12 and 13 m b. 10 m c. 8 m d. less than 8 m C3. When one compares the relativistic kinetic energy to the classically calculated kinetic energy for a moving object, at which of the speeds listed below does the classical calculation give a greater value than the relativistic calculation? a. 0.2 c b. 0.5 c c. 0.707 c d. None of the above values will give such a result. C4. If the nonzero momentum of a particle with mass is doubled, what happens to its total energy? a. It also doubles. b. It increases, more than doubling. c. It stays the same since total energy is a constant for a given particle. d. It increases, but less than doubling. C5. Which form of relativity applies for observers who are accelerating? a. Special relativity applies. b. General relativity applies. c. Both special relativity and general relativity apply. d. Neither applies since the observer must be in an inertial frame to use either one. 189
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Chapter 26, Relativity 26.2 The Speed of Light 1. Which characterizes the main result of the Michelson-Morley experiment? a. verified the existence of ether b. involved measuring the speed of sound from a moving source c. detected no difference in the speed of light regardless of speed of the source relative to observer d. was designed purposely to verify Einstein's theory of relativity 2. The experiment that dispelled the idea that light travels in the ether is called the: a. Michelson-Morley experiment. b. Hafele and Keating experiment. c. Fitzgerald-Kennedy experiment. d. twin paradox. 3. The Michelson-Morley experiment was designed to make use of _________ to find the motion of the Earth relative to the luminiferous ether. a. sound waves b. interference fringes c. electromagnetic wind d. none of the above 4. The significant result of the Michelson-Morley experiment was that it found: a. the ether moved with the sun. b. the ether moved with the Earth. c. the speed of the ether wind was greater than expected. d. no effect. 26.3 Einstein’s Principle of Relativity 5. Einstein’s theory of relativity is based in part on which one of the following postulates?
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TB_chapter26 - Chapter 26 Relativity CHAPTER 26 Conceptual...

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