In quantum mechanics there is a process by which an electron can start in a region of relatively weak forces, enter a classically forbidden region, and then reemerge on the other side of that region. The electron, it can be said, travels through a "wall." How do scientists commonly refer to this process?
e.
The process known as "tunneling" is one of the most bizarre occurrences in nature and is proven both theoretically with quantum mechanics and experimentally with optics and nuclear decay, among other things.
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The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on autumnal equinox for an observer at a latitude of 45° N?
a. 1
b. 2
c. 3
d. The sun will set in the east for an observer in the northern hemisphere.
e. The sun will not set on autumnal equinox at this latitude.
A(n) ____ is a commonly accepted set of scientific ideas and assumptions
a. theory b. paradigm c. hypothesis d. natural law e. model
According to Aristotle, which scenario illustrates violent motion?
a. An apple falling from a tree b. A mass of warm air rising above hot pavement c. An arrow moving through the air after leaving the bow d. A person pushing a car along the street e. A barrel rolling down a ramp
Which statement about terminal speed is true?
a. Terminal speed is the same for all objects. b. Terminal speed is not affected by weight. c. Terminal speed is not affected by air resistance. d. Terminal speed is not affected by size and shape. e. Terminal speed is affected by size, weight, and shape.