The Maxwellian speed distribution provides a direct explanation of:

A. thermal expansion
B. the ideal gas law
C. heat
D. evaporation
E. boiling


Ans: D. evaporation

Physics & Space Science

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The charge of an electron is

a. positive b. negative c. electrons have no charge

Physics & Space Science

Star A and star B both have an apparent magnitude of 7.0, but star A is at a distance of 15 pc and star B is at a distance of 30 pc. Which statement below is correct?

A) Star A appears brighter than star B, but star B and star A have the same intrinsic brightness. B) Star B appears brighter than star A, but star B and star A have the same intrinsic brightness. C) Star A and star B appear to have the same brightness, but star B is intrinsically brighter than star A. D) Star A and star B appear to have the same brightness, but star A is intrinsically brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.

Physics & Space Science

Compared to Jupiter, the motions observed in Saturn's atmosphere are:

A) faster with fewer zone-belt alternations. B) slower with fewer zone-belt alternations. C) faster with more zone-belt alternations. D) slower with more zone-belt alterations. E) nearly identical.

Physics & Space Science

________ attraction holds the electron in orbit around the nucleus of the hydrogen atom.

A. Gravitational B. Electrical C. Nuclear D. Centrifugal

Physics & Space Science