ch37 - Chapter 37 SPECIAL THEORY OF RELATIVITY 1 A basic...

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Chapter 37: SPECIAL THEORY OF RELATIVITY 1. A basic postulate of Einstein’s theory of relativity is: A. moving clocks run more slowly than when they are at rest B. moving rods are shorter than when they are at rest C. light has both wave and particle properties D. the laws of physics must be the same for observers moving with uniform velocity relative to each other E. everything is relative ans: D 2. A consequence of Einstein’s theory of relativity is: A. moving clocks run more slowly than when they are at rest B. moving rods are longer than when they are at rest C. light has both wave and particle properties D. the laws of physics must appear the same to all observers moving with uniform velocity relative to each other E. everything is relative ans: A 3. A consequence of Einstein’s theory of relativity is: A. moving clocks run faster than when they are at rest B. moving rods are shorter than when they are at rest C. light has both wave and particle properties D. the laws of physics must appear the same to all observers moving with uniform velocity relative to each other E. everything is relative ans: B 4. According to the theory of relativity: A. moving clocks run fast B. energy is not conserved in high speed collisions C. the speed of light must be measured relative to the ether D. momentum is not conserved in high speed collisions E. none of the above are true ans: E 5. Two events occur simultaneously on the x axis of reference frame S, one at x = a and the other at x =+ a . According to an observer moving in the positive x direction: A. the event at x =+ a occurs f rst B. the event at x = a occurs f rst C. either event might occur f rst, depending on the value of a and the observer’s speed D. the events are simultaneous E. none of the above ans: A Chapter 37: SPECIAL THEORY OF RELATIVITY 559
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6. Two events occur simultaneously at separated points on the y axis of reference frame S. Ac- cording to an observer moving in the positive x direction: A. the event with the greater y coordinate occurs f rst B. the event with the greater y coordinate occurs last C. either event might occur f rst, depending on the observer’s speed D. the events are simultaneous E. none of the above ans: D 7. A train traveling very fast ( v =0 . 6 c ) has an engineer (E) at the front, a guard (G) at the rear, and an observer (S I ) exactly half way between them. Both E and G are equipped with yellow signaling lamps. The train passes a station, closely observed by the station master (S). Both E and G use their lamps to send signals. According to both S and S I these signals arrive simultaneously at the instant S I is passing S. According to S I : A. E and G sent their signals simultaneously from di f erent distances B. G sent his signal before E and from farther away C. G sent his signal before E but was the same distance away D. E sent his signal before G and from farther away E. none of the above ans: E 8. The proper time between two events is measured by clocks at rest in a reference frame in which
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ch37 - Chapter 37 SPECIAL THEORY OF RELATIVITY 1 A basic...

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