Diffusion is described by
A) Boyle's law.
B) Kepler's law.
C) Charles' law.
D) Graham's law.
E) Archimedes' law.
D
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Why does the Cepheid "standard candle" have limited usefulness beyond 20 Mpc?
A) Distant galaxies are seen in the past, when Cepheid variables behaved differently than they do today. B) Distant galaxies are so young they do not contain Cepheids. C) Cepheids are too faint to be seen beyond that distance, even with HST. D) The light variability of Cepheids diminishes with distance so they do not appear to vary there. E) Older distant Cepheids are of Population II, where the period-luminosity relation no longer works.
The shorter the wavelength of light, the higher its frequency
Indicate whether the statement is true or false
Which of the following statements about Gauss's law are correct? (There may be more than one correct choice.)
A) Gauss's law is valid only for symmetric charge distributions, such as spheres and cylinders. B) If there is no charge inside of a Gaussian surface, the electric field must be zero at points of that surface. C) Only charge enclosed within a Gaussian surface can produce an electric field at points on that surface. D) If a Gaussian surface is completely inside an electrostatic conductor, the electric field must always be zero at all points on that surface. E) The electric flux passing through a Gaussian surface depends only on the amount of charge inside that surface, not on its size or shape.
In an isobaric process, there is no change in
A) pressure. B) temperature. C) volume. D) internal energy. E) heat.