Assume when using a meter stick measuring can be done so that the last significant figure is in the tenth of a millimeter digit. If you are measuring an object with length between 25 and 53 cm, how many significant figures will result if you only use the part of the meter stick between the 3-cm and 85-cm positions?
a. 1
b. 2
c. 3
d. 4
e. more than 4
d
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In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are
A) hydrogen. B) oxygen. C) both the same D) not enough information
Which of the following is true of Seyfert galaxies?
A) They have inactive nuclei. B) They mostly contain dying stars. C) The spectra of their nuclei contain broad emission lines of highly ionized atoms. D) The velocities of gas clouds at their centers are much less than velocities at the center of normal galaxies.
What do we mean by fnow in the Drake equation
(Number of Civilizations = NHP × flife × fcivilization × fnow)? A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us
Case-control studies that attempt to determine which of the following are especially subject to recall bias?
What will be an ideal response?