At the microscopic level, the difference between gases and liquids is that
A) the gas's atoms move throughout the gas, while the liquid's atoms remain near their original locations.
B) in a gas, the individual atoms are larger.
C) there is much more distance [at least 10 times more] between neighboring atoms in a gas than between neighboring atoms in a liquid.
D) both answers A and B are correct.
E) both answers B and C are correct.
C
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Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness extremely rapidly as they rotate on their axes. B) Cepheid variables are stars that brighten and dim with a period that is directly related to the star's luminosity. C) Cepheids are a type of young galaxy that helps us understand how galaxies form. D) Cepheids are supermassive stars that we observe because they will soon undergo supernovae.
Absolute zero is the temperature
A. of the freezing point of water. B. on the coldest day recorded at Nome, Alaska. C. at which an ideal gas would exert zero pressure. D. of the freezing point of mercury. E. of the boiling point of liquid helium.
The white light emitted by a fluorescent lamp is provided by the
A) mercury vapor in the lamp. B) phosphors on the inner surface of the lamp. C) high temperature of the glowing gas. D) filtering effect of the glass tubing.
A billion solar mass black hole has a radius of only:
A) one solar diameter. B) 20 A.U. C) 400 A.U. D) 3 parsecs. E) 20 parsecs.