According to special relativity, at speeds approaching the speed of light, the kinetic energy of a moving object is not equal to 1/2 mv2
a. True
b. False
Indicate whether the statement is true or false
True
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When a light wave enters into a medium of different optical density
A) its speed and frequency change. B) its speed and wavelength change. C) its frequency and wavelength change. D) its speed, frequency, and wavelength change.
In a certain region of space, a uniform electric field is in the x direction. A particle with negative charge is carried from x = 20.0 cm to x = 60.0 cm. The electric potential energy of the charge-field system:
1.increases. 2.remains constant. 3.decreases. 4.changes unpredictably.
What is fluorescence?
a. The emission of light by electrons that have absorbed several infrared photons to reach a higher energy level, before falling down to a lower level. b. Emission of ultraviolet light by passing an electric current through mercury vapor, for example in a fluorescent light bulb. c. Emission of light by electrons in atoms that have absorbed an ultraviolet photon and stayed for some considerable time at higher energy levels before dropping down. d. Emission of light by electrons in atoms after they have absorbed an ultraviolet photon and then dropped down through several energy levels, emitting light in one or more of the steps. e. Light emitted by electrons in atoms after they have absorbed several infrared photons and stayed in the excited state after the infrared light was turned off.
One reason that dislocation motion is difficult in covalently bonded materials such as diamond is that:
(a) The interatomic distance is large. (b) Covalent bonds resist changes in angle. (c) The curvature of the interatomic potential is low. (d) The interatomic potential is shallow.