Which of the following statements about quantum tunneling is not true?
A) It is used in modern electronics and, in fact, our modern-day computers would not work without it.
B) It plays a crucial role in nuclear fusion in the Sun.
C) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.
D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists.
D) Although it has been observed to occur, it violates all other known laws of nature, and explaining it therefore represents a major challenge to physicists.
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The axes on a Hertzsprung-Russell (H-R) diagram represent
A) luminosity and surface temperature. B) mass and luminosity. C) luminosity and apparent brightness. D) mass and radius.
The K-T event occurred about ______________ million years ago
Fill in the blank(s) with correct word
What proves the existence of the Kuiper belt?
A. the fact that comets are icy objects B. the fact that many comets orbit on the ecliptic C. Objects of the Kuiper belt were detected by the Hubble Space Telescope. D. the existence of short-period comets
The oscillation of the 2.0-kg mass on a spring is described by 
where x is in centimeters and t is in seconds. What is the force constant of the spring?
A.
B.
C.
D.
E.
N/m