What is an accretion disk?

A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole
B) any flattened disk in space, such as the disk of the Milky Way Galaxy
C) a stream of gas flowing from one star to its binary companion star
D) a disk of material found around every white dwarf in the Milky Way Galaxy


A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole

Physics & Space Science

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Venus is 95 percent the diameter of Earth

a. True b. False Indicate whether the statement is true or false

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The electron

a. is an absolutely stable particle. b. decays via the weak interaction. c. has zero mass. d. is a lepton.

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In a Young's double-slit experiment, how many maxima occur between the m = +3 and m = -3 maxima?

a. 6 c. 7 b. 8 d. Not given.

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Which of the following technological advances was not useful in the 1930s to advance the study of nuclear reactions?

a. Van de Graaff accelerator.

b. Two-mile long SLAC accelerator. c. Cockcroft-Walton high-voltage multiplier circuit. d. Cyclotron.

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