What is the name of the brown disk rotating around the protostar in the following image?
Choose one:
A. stellar disk
B. planetary disk
C. protoplanetary disk
D. protostellar disk
C. protoplanetary disk
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Why does convection occur in the troposphere, but not in the stratosphere?
A) The troposphere is warmer than the stratosphere. B) The troposphere is cooler than the stratosphere. C) Temperature decreases with altitude in the troposphere, but this trend reverses in the stratosphere. D) Density decreases with altitude in the troposphere, but this trend reverses in the stratosphere. E) The troposphere contains a smaller proportion of greenhouse gases than the stratosphere.
Kinetic energy can be measured in
A. watts B. calories C. grams D. amperes
The planets all lie in nearly the same plane resulting in a disk-like structure for the solar system. This disk-like structure is believed to exist because
a. the solar nebula from which the planets formed had a disk-like structure. b. the bipolar flow from the young sun cleared all material out of the nebula except that in the disk. c. Jupiter's gravity was great enough to pull all of the other planets to the plane of its orbit. d. the Milky Way Galaxy from which the planets condensed has a disk like structure
Consider the Bohr model for the hydrogen atom in its second excited state
(a) Determine the binding energy (eV) of the electron. (b) What is the radius of the electron orbit, given that r1 = 0.0529 nm? (c) How far is it from the next higher excited orbit?