_____ is the process in which dust scatters blue light out of starlight and makes the stars look redder
A) Interstellar reddening
B) A blueshift
C) A redshift
D) Cosmic reddening
A
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Blue light differs from red light in that
a. blue light has a higher energy than red light. b. blue light has a lower energy than red light. c. blue light has a shorter wavelength than red light. d. blue light has a longer wavelength than red light. e. More than one of the above.
The "rare Earth hypothesis" holds that Earth-like planets will prove to be quite rare. Which of the following statements best sums up the current status of the debate over this hypothesis?
A) It is no longer discussed, because as part of its broad cover-up of UFOs, the United States government has classified all the material relating to this debate as Top Secret. B) We do not have enough data to settle the debate, because counterarguments can be made for each argument suggesting Earth-like planets may be rare. C) The debate raged for a while, but is now settled. We are now quite certain that Earth-like planets are rare. D) The debate raged for a while, but is now settled. We are now quite certain that Earth-like planets are common.
A student stands on a chair. The forces acting on her or him are supplied by gravity acting downward and by the ______________ acting upward
Fill in the blank(s) with correct word
Current: When current is flowing in an ordinary metal wire, the magnitude of the average velocity of the electrons is closest to
A. 10 m/s. B. the speed of light. C. 1 mm/s. D. 1 km/s. E. 1 m/s.