Temperature Scales: Express a body temperature 98.6°F in Celsius degrees.
A. 37.0°C
B. 45.5°C
C. 66.6°C
D. 72.6°C
Answer: A
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The Sloan Digital Sky Survey includes many thousands of galaxies in its spectroscopic catalogs. How are the distances to most of these galaxies estimated?
A) from their redshifts and the application of Hubble's Law B) by measuring Cepheid variable light curves C) by measuring their parallax angle as the Earth circles the Sun D) by measuring the light from white dwarf supernovae
The fact that gasoline overflows a full tank on a hot day is evidence that
A) gasoline expands more with increasing temperature than its tank. B) the tank contracts while gasoline expands with temperature. C) both of these D) neither of these
Which of the following statements best reflects our current knowledge about the term flife in the equation Number of Civilizations = Np × flife × fcivilization × fnow?
A) The value of flife must be either 0 percent or 100 percent. B) The value of flife is between 0 percent and 100 percent. C) The value of flife is between 0 percent and 1 percent. D) The value of flife is roughly 50 percent. E) The value of flife is presently unknown but should be well known within just a few years.
In Huygens's construction, all points on a wave front:
a. act as point sources for the production of secondary spherical waves. b. act as particles. c. demonstrate the dual nature of light. d. must be sources of plane waves.