The Kronig-Penney model for electrons within a semiconductor utilizes all of these quantum mechanical constructs EXCEPT:
For a semiconductor with an infinite lattice of potential wells, which the Kronig-Penney model assumes, the electron energy levels are no longer discrete but continuous. The model holds to a very good approximation, since even a relatively small order of magnitude of atoms (103) can make the levels nearly continuous.
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Radiative heat transfer requires a fluid to mediate the energy transfer
Indicate whether the statement is true or false
A current in a long, straight wire produces a magnetic field. The magnetic field lines:
a. go out from the wire to infinity. b. form circles that go around the wire. c. come in from infinity to the wire. d. form circles that pass through the wire.
Explain how we can estimate the geological age of a planetary surface from its number of impact craters
What will be an ideal response?
A uranium atom is 238 times as massive as a hydrogen atom. Compared with the diameter of a hydrogen atom, uranium's size is
A) slightly smaller. B) only slightly larger. C) is much larger, but less than 238 times as large.