Which of the following statements about quantum tunneling is 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.
E) A, B, and C are true, but D is not
E
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The planet whose axis of rotation lies almost in its orbital plane is
a. Neptune. b. Uranus. c. Saturn. d. Jupiter.
If temperature refers to the intensity of agitation then absolute zero is no agitation
a. True b. False Indicate whether the statement is true or false
How was Earth's Moon formed, according to the currently most-accepted theory?
a) It formed from the collapsing protoplanetary disk at the same time as Earth. b) It was a passing body captured by Earth's gravity. c) It formed from debris produced by the collision of a Mars-sized object with the Earth. d) A gigantic volcano on Earth threw out the material that became the Moon. e) No one really knows.
Based on our current Gregorian calendar, which of the following years is not a leap year?
A) 2000 B) 2004 C) 2008 D) 2012 E) All of the above are leap years.