An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air?
a. 20°
b. 30°
c. 38°
d. 69°
e. 26°
b
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Evaporation from the oceans produces clouds that precipitate fresh water rather than saltwater because
A) salt is too heavy to evaporate. B) evaporation produces nearly pure water vapor. C) dissolved salt prevents evaporation. D) saltwater precipitates over oceans only.
For general projectile motion if we neglect air, the horizontal component of a projectile's acceleration
A) is always zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) first decreases and then increases.
In the context of spectral classes, which of the following statements is true of T dwarfs?
A) They are a spectral class of red giant stars. B) They are hotter than L dwarfs. C) They are a spectral class of white giant stars. D) They are fainter than L dwarfs.