In the classical Drude model of electricity, resistance occurs because the charge carriers, which are accelerated due to electric forces, collide with the atoms of the metal wire, causing them to bounce backward
What should you expect the Drude model to predict for the relative resistance of two materials, one of which has twice as many atoms in each cubic meter of material?
Because there are more opportunities for collisions with twice as many atoms in
each volume, we would expect the resistivity (and the resistance) to be double that of the
material with fewer atoms per cubic meter.
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You are asked to design a metal alloy for a high temperature application. What type of metal alloy phase diagrams should you consider first for this application?
(a) Continuous solid solution (b) Eutectic (c) Compound formation (d) Peritectic
What is spacetime?
A) Time that we measure when traveling in space. B) It's a graph with four axes. C) It is a way of viewing books at different angles. D) The inseparable combination of space and time.
In single-slit diffraction
A) the central maximum is about as wide as the other maxima. B) the central maximum is much narrower than the other maxima. C) the central maximum is about twice as wide as the other maxima. D) the intensities of successive maxima are roughly the same, falling off only gradually as one goes away from the central maximum. E) the slit width must be less than one wavelength for a diffraction pattern to be apparent.
Length Contraction: A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light. The height of the train, as measured by a stationary observer on the ground,
A. approaches infinity. B. approaches zero. C. increases slightly. D. decreases slightly. E. does not change due to the motion.