In the fission reaction 235U + 1n ? 141Ba + 92Kr + x 1n, what is the number x of neutrons produced?
A) 0
B) 1
C) 2
D) 3
D
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Which of the following best defines a sandbox?
A. A script that seems innocent, but actually has malware. B. A development environment used to create widgets. C. A web form element used for longer, memo-type entries. D. A browser feature that restricts a script from running.
The current definition of the standard meter of length is based on
A) the distance between the earth's equator and north pole. B) the distance between the earth and the sun. C) the distance traveled by light in a vacuum. D) the length of a particular object kept in France.
A metallic sphere A of radius 1 cm with charge 450 nC hangs on an insulating thread inside an uncharged thin metallic spherical shell B of radius 2 cm. Next, A is made temporarily to touch the inner surface of B. How is the charge then shared between them?
In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by certain krypton atoms c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second