When the intensity of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases
b. decreases
c. stays the same
d. becomes more quantized
e. becomes less quantized
C
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Design a composite material made of epoxy and uniaxial E-glass fibers that has an axial thermal conductivity of 8 Wm-1 K-1 . The thermal conductivity of E-glass is 13 Wm-1 K-1 , and for epoxy it is 0.1 Wm-1 K-1 .
(a) What is the volume fraction of fibers and matrix in this composite? (b) What is the transverse thermal conductivity of this material?
Resistance and Resistivity: A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A. be the same as the original diameter. B. be one-half the original diameter. C. be one-fourth the original diameter. D. be two times the original diameter. E. be four times the original diameter.
The unit of resistance is named after
A) Isaac Newton. B) Benjamin Franklin. C) Georg Simon Ohm. D) Micheal Faraday. E) Charles Coulomb.
Light entering a transparent material from the air:
a. bends toward the normal. b. bends away from the normal. c. bends toward its source. d. does not bend. e. is entirely reflected.