The darkness of clouds is due to
A) absorption.
B) often being in the shadow of another cloud.
C) both of these
D) neither of these
Answer: C
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How are galaxies spread throughout the universe?
A) Galaxies are densest near the Milky Way Galaxy and become less and less numerous the farther we look out into the universe. B) Galaxies are grouped in clusters that are spread more or less evenly throughout the universe. C) Galaxies are spread more or less evenly throughout the universe. D) Clusters of galaxies exist that are themselves often clustered into superclusters. Clusters and superclusters appear to be distributed on surfaces surrounding empty regions of space.
Tensile Stress and Strain: As one stretches a metal wire, which condition is reached first?
A. the elastic limit B. the breaking point C. the proportional limit
Studying a spectrum from a star can tell us a lot. All of the following statements are true except one. Which statement is not true?
A) The total amount of light in the spectrum tells us the star's radius. B) The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer) wavelengths. C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. D) Shifts in the wavelengths of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us.
Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will draw
A) more current. B) less current. C) the same current.