Which statement about accretion disks is not true?
A) The primary factor determining whether a white dwarf has an accretion disk is the white dwarf's mass.
B) The gas in the inner parts of the disk travels faster than the gas in the outer parts of the disk.
C) The gas in the inner parts of the disk is hotter than the gas in the outer parts of the disk.
D) Accretion disks are made primarily of hydrogen and helium gas.
A) The primary factor determining whether a white dwarf has an accretion disk is the white dwarf's mass.
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If you had only one telescope and wanted to take both visible-light and ultraviolet pictures of stars, where should you locate your telescope?
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A 10-V battery is connected to a 15-? resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-? resistor in 2.0 min?
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