In the extrinsic range of operation of a p-type semiconductor made from silicon with acceptor atoms of gallium, the concentration of holes in the valence band (p) is equal to the concentration of:
(a) Gallium atoms
(b) Silicon atoms
(c) Donor atoms
(d) Electrons in the conduction band
(a) Gallium atoms
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Nuclear fusion is a process in which
A) atoms combine into molecules. B) two or more light nuclei are combined into a single heavier nucleus. C) a heavy nucleus is split into two or more lighter nuclei. D) a small particle is spontaneously emitted from a nucleus. E) None of the above.
Quantum tunneling occurs in
a. nuclear fusion. b. radioactive decay by emission of alpha particles. c. the scanning tunneling microscope. d. all of the above. e. only (b) and (c) above.
Beats: A music tuner uses a 554-Hz C# tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?
A. It must be 556 Hz. B. It must be 552 Hz. C. It could be either 556 Hz or 552 Hz. D. It could be either 553 Hz or 555 Hz. E. It is neither 556 Hz or 552 Hz.
While a stone is falling [neglecting air resistance],
A) its speed is changing. B) the direction of its velocity is downward. C) it is accelerated. D) All of the above. E) None of the above.