The two fundamental laws that lie at the heart of quantum mechanics are
A) the absoluteness of the speed of light and the equivalence principle.
B) the law of conservation of energy and the electromagnetic force law.
C) the uncertainty principle and the exclusion principle.
D) the law of conservation of angular momentum and the law of conservation of energy.
E) the law of quantum degeneracy and the law of inviolate absolutes.
C
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How does the light from active galaxies differ from that of a normal galaxy?
What will be an ideal response?
When light travels from air into water,
A) its velocity, wavelength and frequency all change. B) its velocity changes, but its frequency and wavelength do not change. C) its frequency changes, but its velocity and wavelength do not change. D) its velocity and wavelength change, but its frequency does not change. E) its wavelength changes, but its velocity and frequency do not change.
Radial velocity is that component of an object's velocity that is directed perpendicular to an observer's line of sight
Indicate whether the statement is true or false
The rest energy of an electron and its antiparticle, a positron, is 0.511 MeV. In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.