The kinetic energy of an electron in orbit in hydrogen is _______ times its potential energy.
A. 1
B. -1
C. 1/2
D. -1/2
E. 2
D. -1/2
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A website's CTA is its call-to-______.
A. advance B. assess C. action D. analyze
In accord with general relativity, a person living at the top of a skyscraper ages
A) faster than a person on the ground floor. B) slower than a person on the ground floor. C) at the same rate as a person on any floor.
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), we expect the term fciv to be small if ________
A) most of the civilizations that have ever existed are still out and about in the galaxy B) primitive life is common but intelligent life is rare C) most habitable planets never actually get life on them D) most civilizations destroy themselves within just a few hundred years of arising
Name each of the factors in the Drake equation
What will be an ideal response?