Which of the following is NOT a true statement about the relationship between the thermal expansion of a solid and the potential energy of an ion in a solid?
c.
This statement is not true. Ions oscillate from the minimum separation as the temperature increases, but their energy is not exactly that of a simple harmonic oscillator. The potential energy curve for an ion in a solid is not symmetrical about the minimum separation. In a simple harmonic oscillator, the potential curve is completely symmetrical. The asymmetry of the ion's curve leads to thermal expansion.
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The expansion of the universe seems to be accelerating. The evidence for this is based on observations of
A) the manner in which the stars are distributed in our own galaxy. B) the cosmic background radiation. C) the slowing down in the pulsation rate of distant neutron stars. D) gas clouds orbiting the centers of galaxies. E) the redshift in the light from the explosions of distant supernovas.
Air temperature can increase by the process of
A) moisture condensation. B) contact with cold surfaces. C) moisture evaporation. D) all of the above
When current is flowing in a superconductor, which statement is not true?
a. The resistance is zero. b. No power is given off in the form of heat. c. A battery is needed to keep the current going. d. Electrical charges are moving.
Photon Momentum: If the frequency of a light beam is doubled, what happens to the momentum of the photons in that beam of light?
A. It stays the same. B. It is halved. C. It is doubled. D. It is reduced to one-fourth of its original value. E. It is increased to four times its original value.