Compared to our own Galaxy, elliptical galaxies
A) have bluer stars.
B) show more internal structure.
C) have no arms, but a better defined disk.
D) have more dust.
E) show no evidence of ongoing star formation.
E
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Explain why the term acceleration is important to the first postulate of special relativity
What will be an ideal response?
Why are auroras produced only near the northern and southern magnetic poles of a planet?
a. Those are the locations where the atmosphere is thinner, letting particles penetrate. b. The poles are pointing toward the Sun, so they receive more solar wind particles. c. The oxygen atoms responsible for auroral emission only exist near the poles. d. Charged particles are forced to flow along Earth's magnetic field lines, which come out of Earth's poles.
In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe in the resulting diffraction pattern?
A) It stays the same. B) It becomes narrower. C) It becomes wider.
If an electroscope is charged by induction
A) nothing will happen since electroscopes require being charged by conduction. B) it will acquire a negative charge. C) its leaves will separate because of the interaction of the charges. D) its leaves will remain attached. E) it will acquire a positive charge.