If the induced current in a wire loop were such that the flux it produces is in the same direction as the change in external flux causing the current, which of the following conservation laws would end up being violated?
a. energy
c. momentum
b. charge
d. angular momentum
A
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The number of technological civilizations in our galaxy is limited by
a. the number of stars in our galaxy. b. the fraction of stars with planets. c. the number of planets per star in habitable zones longer than a few billion years. d. the fraction of suitable planets where technical life forms evolve. e. the number of stars in our galaxy, the fraction of stars with planets, the number of planets per star in habitable zones longer than a few billion years, and the fraction of suitable planets where technical life forms evolve.
Which statement about stellar motion is incorrect?
A) In general, the closer a star is, the more its proper motion. B) The radial velocity is measured by the Doppler shift. C) The transverse velocity is measured by the proper motion and the distance. D) Like parallax, proper motion is measured over intervals of exactly six months. E) The Pythagorean theorem relates space, transverse, and radial velocities.
Spectral Series: Hydrogen atoms can emit four spectral lines with visible colors from red to violet. These four visible lines emitted by hydrogen atoms are produced by electrons
A. that start in the n = 2 level. B. that end up in the n = 2 level. C. that end up in the n = 3 level. D. that end up in the ground state. E. that start in the ground state.
Suppose a jet is cruising at a constant velocity due east. At the instant the jet is above your head, what is the direction of the jet’s angular momentum around you? Choose from the possible directions presented in problem C7T.3, remembering that this is a top view, with A corresponding to north, C to east, and so on. 
A. A B. B C. C D. D E. Upward F. Downward T. (The vector is zero)