When most substances are heated, molecules inside move faster and occupy more space, which results in thermal
A) bending.
B) expansion.
C) contraction.
D) heat.
Answer: B
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Silicon doped with arsenic produces an n-type semiconductor with a donor level at 0.049 eV below the conduction band in an energy gap of 1.1 eV.
(a) What is the wavelength of the lowest energy absorption edge for this semiconductor? (b) To what region of the electromagnetic spectrum does this wavelength correspond?
If two parallel, conducting plates have equal positive charge, the electric field lines will:
a. leave one plate and go straight to the other plate. b. enter both plates from infinity. c. leave both plates and go to infinity. d. none of the above.
Lightning is dangerous to humans because lightning strokes
a. carry large currents c. have no resistance b. have high voltages d. fry whatever they hit
Temperature is most closely related to molecular
A) kinetic energy. B) potential energy. C) electrical energy. D) mechanical energy in general.