Evolutionary hypotheses suggest that planets form by natural and gradual processes
a. True
b. False
Indicate whether the statement is true or false
True
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In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), what do we mean by fnow?
A) the fraction of civilizations in the universe that currently are sending messages to us B) the fraction of planets in the galaxy on which a civilization could theoretically develop right now C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets with civilizations at the present time (as opposed to only in the past or future)
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The resistance of the light bulb is __________
Fill in the blank(s) with correct word
Does Hubble's law work well for galaxies within the Local Group? Why or why not?
A) no, because galaxies in the Local Group are gravitationally bound together B) no, because Hubble did not know the Local Group existed when he discovered his law C) no, because we do not know the precise value of Hubble's constant D) Yes, it works so well that we have never detected any measurable deviations from its predictions.
Based on atomic size, which would you expect to be more soluble in water: helium, He, or nitrogen, Image?
A) Although He is smaller, its outer orbital is filled and the atom will have little attraction to the water molecules. B) Since He atoms are smaller, more of them can fit into solution, so it has a higher solubility in water. C) Nitrogen atoms are bigger and so nitrogen molecules should be more soluble in water due to greater dipole-induced dipole attractions. D) He atoms are bigger and so helium molecules should be more soluble in water due to greater dipole-induced dipole attractions.