Spherical aberration can occur in
A) mirrors and lenses.
B) mirrors but not lenses.
C) lenses but not mirrors.
A
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Two pairs of sunspots appear similar, but if one photo was made in 1990, and the next photo was in 2002, we would note what difference?
What will be an ideal response?
A 1959 penny has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2.500 g. What is its density?
A) 5.37 × 103 kg/m3 B) 21.5 × 103 kg/m3 C) 1.34 × 103 kg/m3 D) 2.68 × 103 kg/m3 E) 1.86 × 10-4 kg/m3
In general, as you examine stars on the main sequence, going from bottom right to top left, their stellar radii ________
Fill in the blank(s) with correct word
Regarding the question of the precise time at which a radioactive nucleus will decay:
A) The time is completely unpredictable (i.e., we cannot know anything about it), because we cannot know anything about an object as small as an individual nucleus. B) The time is only statistically predictable, because our measuring instruments are not yet sufficiently precise. C) The time is precisely predictable for any particular isotope, regardless our knowledge of its precise state. D) The time is only statistically predictable, because of unavoidable uncertainties associated with quantum theory. E) The time is precisely predictable, provided we have sufficient information about the condition of the nucleus.