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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Exclusion Principle: The electron spin quantum number can have values of
A. -1/2, -1, 0, +1, +1/2. B. -1/2, -1, +1, +1/2. C. -1/2, 0, +1/2. D. -1/2, +1/2. E. only +1/2.
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?
A. 0.40 kJ B. 0.19 kJ C. 0.29 kJ D. 0.72 kJ E. 0.80 kJ
If you had only one telescope and wanted to take both visible-light and ultraviolet pictures of stars, where should you locate your telescope?
A. on Earth’s surface B. on a tall mountain C. in an airplane D. in space
A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thicker and heavier. What is the orientation of the reflected and transmitted pulses?
A) Both are right side up. B) The reflected pulse returns right side up while the transmitted pulse is inverted. C) The reflected pulse returns inverted while the transmitted pulse is right side up. D) Both are inverted. E) It is impossible to predict.