Which part of the electromagnetic spectrum would we use to study the relatively cool dust of interstellar space?
A. visible light
B. radio waves
C. gamma rays
D. ultraviolet light
E. infrared light
Answer: E
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When the distance between two stars decreases by one-third, the force between them
A) decreases by one-third. B) decreases by one-half. C) increases to twice as much. D) increases to nine times as much. E) none of the above
A solid glass ball weighs 1 N. One with twice the diameter weighs
A) 1 N. B) 2 N. C) 3 N. D) 4 N. E) more than 4 N.
In discussing the electron double-slit experiment, we studied a graph of the extended wave pattern formed on the screen by each electron's matter field
Did this graph show a single electron's matter field just before, or just after, the electron strikes the screen, and why? A) This is the matter field just after impact, because each electron actually spreads out over a large region and strikes all over this region, in a wave pattern. B) This is the matter field just before impact; after impact, the electron acquires a definite velocity. C) This is the matter field just before impact; after impact the matter field transforms into two distinct parts, with one part appearing on the screen directly behind each slit. D) This is the matter field just after impact, because the electron can strike the screen at a wide variety of specific places, and these places form a field pattern. E) This is the matter field just before impact; after impact the matter field collapses into a small region around the impact.
A star of spectral type O lives approximately how long on the main sequence?
A) 1,000 years B) 10,000 years C) 10 million years D) 100 million years E) 1 billion years