What are constellations?
A) groups of galaxies gravitationally bound and close together in the sky
B) groups of stars making an apparent pattern in the celestial sphere
C) groups of stars gravitationally bound and appearing close together in the sky
D) ancient story boards, useless to modern astronomers
E) apparent groupings of stars and planets visible on a given evening
B
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Many of the extrasolar planets that have been detected directly to date are
A) very large and at great distances from their parent star B) small and at great distances from their parent star C) small and close to their parent star D) very large and close to their parent star
Laser light is ________ and monochromatic, and usually of much ________ intensity than the light from the light bulb
a. coherent b. incoherent c. lower d. higher
The symbol indicating the number of protons in a nucleus is N
a. True b. False Indicate whether the statement is true or false
A cube of water ice (r = 0.917 × 10^3 kg/m3) is placed in mercury (r = 13.6 × 10^3 kg/m3), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is
a. 0.067 4. b. 0.073 5. c. 0.926. d. 0.933. e. 1.00.