Equal masses of hydrogen and helium gas are at the same temperature in vessels of equal volume. The atomic mass of helium is four times that of hydrogen. If the total mass of both gases is the same, the ratio of the pressure of helium (He) to that of hydrogen (H2) is
A.
.B.
.C.
D.
E.
Answer: B
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Vision Problems: What power (in diopters) of corrective contact lens is required to correct the vision of a myopic eye whose far point is at 170 cm?
Fill in the blank(s) with the appropriate word(s).
What evidence suggests that some of the stars in the halo of the Milky Way Galaxy came from mergers with other galaxies?
A) Globular clusters are typically found only in the halo. B) Some halo stars with similar and distinct chemical compositions move together in organized streams. C) Some halo stars are older than our Galaxy. D) Halo stars have randomly oriented orbits.
Rank the five terrestrial worlds in order of size from smallest to largest
A) Mercury, Venus, Earth, Moon, Mars B) Mercury, Moon, Venus, Earth, Mars C) Moon, Mercury, Venus, Earth, Mars D) Moon, Mercury, Mars, Venus, Earth E) Mercury, Moon, Mars, Earth, Venus
Compared to noise, musical sounds have
A) periodic tones. B) musical notes. C) both of these D) neither of these