Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness.
B) Star B appears brighter than star A, but actually star B and star A are the same brightness.
C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A.
D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B.
E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
D
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What are the signs of Q, W, and ?U for the process 
?
A. 0, -, - B. 0, +, + C. +, -, 0 D. +, +, 0 E. -, +, 0 F. Other (specify)
A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially parallel to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines. b) It will follow a circular path in the plane perpendicular to the magnetic field lines. c) It will follow a straight line path in the same direction as it was initially traveling. d) It will follow a circular path in a plane parallel to the magnetic field lines. e) It is impossible to predict the path the particle will follow.
You are seated in a bus and notice that a hand strap that is hanging from the ceiling hangs away from the vertical in the backward direction. From this observation, you can conclude that
A) the velocity of the bus is backward. B) the velocity of the bus is forward. C) You cannot conclude anything about the direction of the velocity of the bus.
The Dirac theory predicted that a positron would be:
a. a particle with same mass as an electron but with opposite charge. b. a particle with negative mass. c. a negative electron in a negative energy state. d. All of the above.