When a colored light in air shines on water and is refracted, its frequency
A) decreases.
B) remains unchanged.
C) increases.
Answer: B
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In heat transfer, the heat flux is directly related to the temperature _____________.
Fill in the blank(s) with the appropriate word(s).
The maximum mass of a white dwarf is ________
A) limitless; there is no theoretical limit to the maximum mass of a white dwarf B) about the mass of our Sun C) about 1.4 times the mass of our Sun D) about 3 times the mass of our Sun
Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin?
a. 200 ?T b. 600 ?T c. 450 ?T d. 300 ?T e. 400 ?T
A charge Q is positioned at the center of a sphere of radius R. The flux of the electric field through the sphere is equal to ?
If the charge Q is now placed at the center of a cube the flux of the electric field through the surface of the cube is equal to A) ?/2. B) ?. C) 2?. D) 0. E) The value of the flux depends on the dimensions of the cube.