Which of the following statements is true?
A)
In a p-type doped semiconductor the donor level is close to the valence band.
B)
In an n-type doped semiconductor the acceptor level is close to the valence band.
C)
In a p-type doped semiconductor the acceptor level is close to the valence band.
D)
In an n-type doped semiconductor the donor level is close to the valence band.
E)
None of the statements are true.
C
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Two water waves, call them X and Y, have the same amplitude, but X has a higher frequency than Y. Regarding their wavelengths and their energies,
A) Y has the larger wavelength and the two waves carry the same energy. B) X has the larger wavelength and carries the greater energy. C) Y has the larger wavelength and carries the greater energy. D) Y has the larger wavelength and X carries the greater energy. E) X has the larger wavelength and Y carries the greater energy.
For this situation, I push on a heavy chair.Suppose I push lightly on the chair, and the chair doesn't move at all. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair. b. equal to the force I exert on the chair. c. greater than the force I exert on the chair. d. zero.
A 60-W light bulb connected to a 120-V source draws a current of
A) 0.25 A. B) 0.5 A. C) 2.0 A. D) 4.0 A. E) more than 4 A.
An object is moving with constant non-zero acceleration in the +x direction. The velocity versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve.