How does the data from ALMA provide direct evidence for nebular theory?
A) It shows concentric gaps in the disk which are almost certainly regions being cleared as planets form.
B) We can see large planets forming.
C) The amount of energy being radiated by the star system indicates there must be planets present.
D) Data from ALMA does not support nebular theory, instead it is causing scientists to revise the theory.
A
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For a standing wave in an air column in a pipe that is open at both ends, there must be at least
a. one node and one antinode. b. two nodes and one antinode. c. two antinodes and one node. d. two nodes and two antinodes.
The rare earth element gadolinium is ferromagnetic, and it has a saturation magnetization of 20×105 A/m at low temperatures.
(a) Calculate the number of Bohr magnetons per atom of gadolinium atom, knowing that the atomic mass is 157.2 g/mole and the density is 7.89 g/cm3. (b) What is the average number of parallel unpaired electron spins in the 4f shell per gadolinium atom?
Rather than being a planet, Pluto is really just a large member of
A) the Kuiper belt. B) an extrasolar planetary system. C) the Oort cloud. D) the moon system around Neptune. E) the asteroid belt.
When you blow some air above the upper face of a paper strip, the paper rises. This occurs because
A) the air above the upper face of the paper moves faster, which makes the pressure lower than at the lower face. B) the air above the upper face of the paper moves faster, which makes the pressure higher than at the lower face. C) the air above the upper face of the paper moves slower, which makes the pressure lower than at the lower face. D) the air above the upper face of the paper moves faster but the pressure remains constant. E) the air above the upper face of the paper moves slower, which makes the pressure higher than at the lower face.