Which subatomic particle or particles is/are found in the nucleus of an atom?
A) protons and neutrons
B) protons only
C) neutrons and electrons
D) electrons and protons
A
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The secondary rainbow is dimmer than the primary rainbow mainly because
A) its colors are inverted. B) it is larger, and its energy is spread over more area. C) it is farther from the viewer. D) it simply has less energy than the primary bow. E) of an extra reflection and refraction in the drops.
Earth is nearly twice as large as Venus
Indicate whether the statement is true or false
The number density of conduction electrons in a metal can be found from the density ? of the metal, the mass per mole M of the metal, the number of conduction electrons per metal atom, and Avogadro's number NA. If we assume one conduction electron per atom, which of the following gives the number density of conduction electrons for a given metal?
a. NA ?M b. NA ? /M c. NA M /? d. NA /?M
In which case does an electric field do positive work on a charged particle?
a. A negative charge moves opposite to the direction of the electric field. b. A positive charge is moved to a point of higher potential energy. c. A positive charge completes one circular path around a stationary positive charge. d. A positive charge completes one elliptical path around a stationary positive charge.