A solar eclipse occurs when the Moon is at or
near
a) full phase.
b) new phase.
c) first-quarter phase.
d) last-quarter phase.
b
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What do quasars look like?
a) Fuzzy, extended patches of light. b) Large concentrations of dark matter. c) Individual stars in the Milky Way. d) Glowing gas clouds. e) Planetary nebulae
Give an estimate of the number of steps in the stairway of a ten-story building.
A. 101 B. 102 C. 103 D. 104
Spots of sunlight on the ground cast through openings between leaves in trees above are actually
A) images of the Sun. B) part of a solar eclipse. C) due to refraction of sunlight. D) all of the above
An electron has been accelerated by a potential difference of 100 V. If its position is known to have an uncertainty of 1 nm, what is the percent uncertainty (?p/p × 10^0) of the electron?
a. 1% b. 2% c. 10% d. >>10% e. 5%