Geologists have principally used which class of rocks for radiometric dating?
a. Sedimentary
b. Igneous
c. Foliated
d. Metamorphic
b
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Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points in the +y direction and has a magnitude that depends only on y. For which of the following gaussian surfaces would it be easiest to calculate the net flux of the electric field?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis. B. A spherical surface. C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis. D. A cylindrical can-like surface oriented with its central axis parallel to the y axis. E. A cone-like surface oriented with its central axis parallel to the y axis.
An acoustical engineer in designing a music hall is concerned with
A) echoes. B) reflection. C) reverberations. D) all of the above E) none of the above
In a nuclear reactor, the control rods must be able to
A) absorb neutrons. B) absorb 235U. C) slow neutrons down without absorbing them. D) remove the heat from the fissioning uranium. E) absorb 238U.
The penumbra caused by an extended light source, as seen in this figure, results from what?
a. The superposition of images from point light sources spread throughout the region covered by the extended source. b. The poorer quality light source in the right hand figure. c. The image of the extended light source on the screen. d. Scattered light from other nearby objects. e. Light leaking into the room from outside sources.