The velocity of light going from air to glass ______
Fill in the blank(s) with the appropriate word(s).
Answer: changes at the boundary
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A beam of protons in an accelerator incident on a metal plate carries a current of 150 ?A. How many protons strike the plate in 24.0 s?
a. 1.60E+5 b. 3.60E+9 c. 2.25E+16 d. 3.91E+13
Which of the following is NOT a property of elliptical galaxies?
A. They have little dust or cold gas. B. They have prominent spiral arms. C. They contain mostly old (Pop II) stars. D. Stars are distributed smoothly throughout their volume.
Which of the following particles are made up of quarks? (There may be more than one correct choice.)
A) neutrinos B) muons C) hadrons D) mesons E) nucleons
What is an artificial star?
A) a meteor B) the unseen member of a binary star system C) a satellite orbiting Earth D) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations E) a possible source of dark matter in the universe