Ninety-five percent of light incident on a mirror is reflected. How much light is reflected when three of these mirrors are arranged so light reflects from one after the other?
A) 81%
B) 85%
C) 86%
D) 90%
E) 95%
Answer: C
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The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by which of the following?
a. (Irms)2R c. 2.0 × (Irms)2R b. 4.0 × (Irms)2R d. 0.5 × (Irms)2R
From the 1970s to the present, the accepted value of H has almost doubled, so:
A) the age of the universe is twice as old as we originally believed. B) the age of the Universe is half what we believed. C) the Copernican principle is not valid beyond our solar system. D) the ages of the oldest globular clusters are invalid. E) the critical density must also be halved.
At this time, the universe is:
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
Which of the following best describes the modern definition of a constellation
a) a group of stars that all lie at about the same distance from Earth b)a region of the celestial sphere c)a pattern of bright stars in the sky