A star's luminosity depends only on the star's
a. distance and diameter.
b. temperature and distance.
c. distance.
d. temperature and diameter.
e. apparent magnitude.
d
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The factor fnow, in the Drake equation depends on
A) whether a civilization ever develops intelligence B) whether a planet has any kind of life on its surface right now C) how technologically advanced civilizations become D) how long civilizations survive once they have arisen
In an isothermal process
a. the volume remains constant. b. the temperature remains constant. c. no heat is transferred between a system and its surroundings. d. the pressure remains constant. e. the internal energy is not constant.
In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the wavelength of the source is doubled?
a. 1/2 c. 1 b. 1/4 d. 2
Which of the following is true?
A. Energy is measured in joules, and power is measured in calories. B. Power is energy divided by time. C. Batteries release energy, but TNT releases power. D. Power signifies a very large value of energy. E. All of the above.