Earth's internal layers were discovered by studying
A) seismic waves.
B) the Mohorovicic discontinuity.
C) Rayleigh and Love waves.
D) convection cells.
Answer: A
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The kind of molecular motion that mostly relates to the temperature of a substance is
A) translational motion. B) rotational motion. C) vibrational motion. D) all about equally
Before a thunder storm, clouds in the sky likely become
A) conducting. B) polarized. C) grounded. D) a field-free region.
The index of refraction for crown glass, common in eyeglasses, is 1.52. The index of refraction of a particular plastic lens is 1.76. Light bends more in the
A) crown glass. B) plastic lens. C) same speed in each. D) need more information
Two long parallel wires carry unequal currents in the same direction. The ratio of the currents is 3 to 1 . The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 mT. What is the larger of the two currents?
a. 5.3 A b. 3.8 A c. 4.5 A d. 3.0 A e. 0.5 A