Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where:
a. the crest from one wave overlaps with the crest from the other.
b. the crest from one wave overlaps with the trough from the other.
c. the troughs from both waves overlap.
d. darkness cannot occur as the two waves are coherent.
b
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A. +x direction B. -x direction C. +y direction D. -y direction E. +z direction F. -z direction T. The field is zero.
What is (are) the unit(s) for the diffusion constant?
a. m2 b. m2/s c. It is unitless. d. m/s1/2
High-temperature superconductors are made of
A. ceramics with copper, yttrium, barium, and oxygen. B. noble gases like helium layered with highly reactive gases like hydrogen. C. 99.999% pure copper. D. metallic hydrogen.
A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor
a. 0.96 mT b. 1.7 mT c. 0.55 mT d. 1.2 mT e. 0.40 mT