Two small balls, A and B, attract each other gravitationally with a force of magnitude F. If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force on each one?
A) 16F
B) 8F
C) 4F
D) F
E) F/4
D
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Two light waves combine and produce a region of darkness. Which of the following must be true in that region?
A. The waves had different wavelengths B. The waves were a half-wavelength out of phase C. The waves were unpolarized D. The waves came from the same source
Three point charges, 
and
are located at the vertices of an equilateral triangle of side length 30 cm. What is the potential energy of this arrangement?
A. 0.24 J B. 0.12 J C. -0.24 J D. -0.12 J E. 0
According to quantum theory, the electron in a particular quantum state of the hydrogen atom has
A) a definite position. B) a definite energy. C) a definite velocity. D) All of the above. E) None of the above.
Standing Sound Waves: In a resonating pipe that is open at both ends, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at one end and a displacement antinode at the other end. D. None of these choices are correct.