What is the average distance between air molecules at STP?
a. 
b. 
c. 
d. 
a.
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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.
The element with the most stable nucleus and smallest mass per particle is:
A) uranium. B) argon. C) helium. D) hydrogen E) iron.
On the H-R diagram, the Sun lies
A) about the middle of the main sequence. B) at the top left. C) at the bottom right. D) at the bottom left. E) at the top right.
The ratio of the density of a material to the density of water is
a. the mass density. b. the weight density. c. the specific gravity. d. the buoyant force. e. none of the above.