18- The speed of light in vacuum is about:A. 1100 ft/sB. 93 x 10*6 m/sC.6 x 10*23 m/sD. 3 x 10*10 cm/sE. 186, 000 mph19- Which of the following types of electromagnetic radiation travels at the greatest speed invacuum?A. Radio wavesB. Visible lightC. X raysD. Gamma raysE. All of these travel at the same speed20- An electromagnetic wave is generated by:A. any moving chargeB. any accelerating chargeC. only a charge with changing accelerationD. only a charge moving in a circleE. only a charge moving in a straight line21- The velocity of an electron is changed from c/2 in the -x direction to c/2 in the +x direction. Asa result, its kinetic energy changes by:A. mc*2B. 0.5m c*2C. V 2m c*2D. 2m c*2E. zero

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18- The speed of light in vacuum is about: A. 1100 ft/s B. 93 x 10*6 m/s C.6 x 10*23 m/s D. 3 x 10*10 cm/s E. 186, 000 mph

18- The speed of light in vacuum is about: A. 1100 ft/s B. 93 x 106 m/s C.6 x 1023 m/s D. 3 x 10*10 cm/s E. 186, 000 mph

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter13: Universal Gravitation

Section: Chapter Questions

Problem 13.71AP

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Concept explainers

Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.

Question

18- The speed of light in vacuum is about:
A. 1100 ft/s
B. 93 x 10*6 m/s
C.6 x 10*23 m/s
D. 3 x 10*10 cm/s
E. 186, 000 mph
19- Which of the following types of electromagnetic radiation travels at the greatest speed in
vacuum?
A. Radio waves
B. Visible light
C. X rays
D. Gamma rays
E. All of these travel at the same speed
20- An electromagnetic wave is generated by:
A. any moving charge
B. any accelerating charge
C. only a charge with changing acceleration
D. only a charge moving in a circle
E. only a charge moving in a straight line
21- The velocity of an electron is changed from c/2 in the -x direction to c/2 in the +x direction. As
a result, its kinetic energy changes by:
A. mc*2
B. 0.5m c*2
C. V 2m c*2
D. 2m c*2
E. zero

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