An electron has the same de Broglie wavelength as a 390 nm photon. The speed of the electron is closest to:
A) 1,900 m/s
B) 2,100 m/s
C) 1,700m/s
D) 1,500 m/s
E) 540 m/s
A
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a. True b. False Indicate whether the statement is true or false
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal and opposite to the flux through the other half of the Gaussian surface. This is
A. never true. B. never false. C. true whenever enclosed charge is symmetrically located at a center point, or on a center line or centrally placed plane. D. true whenever no charge is enclosed within the Gaussian surface. E. true only when no charge is enclosed within the Gaussian surface.
A(n) _________is a device that allows the angle of a sample relative to a reference to be changed and measured.
Fill in the blank(s) with the appropriate word(s).
When a voltage is applied across a p-type semiconductor, the holes
A) are destroyed. B) move toward the negative electrode. C) do not move. D) move toward the positive electrode.