The dustiest and flattest spiral galaxies are in Hubble's class
A) Sc. B) Sa. C) SBa. D) S0. E) SBc.
A
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Which of the following would be the closest estimate to the number of times the Sun has orbited the galactic center?
a. 1 b. 10 c. 25 d. 50 e. 100
A 5-N block of wood is difficult to fully submerge in a pool of mercury because the buoyant force on the block when submerged is
A) less than 5 N. B) 5 N. C) much more than 5 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.
When a ?- particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) increases by 1. B) decreases by 1. C) increases by 2. D) decreases by 2. E) does not change.