What is the effect applied electric field on the band structure of a conductor?
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What is the effect applied electric field on the band structure of a conductor?
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- What is the difference between the drift velocity of the electrons in a conductor and the speed of an electrical signal? If there is a difference in speed, which is faster?Parallel conducting plates create nearly uniform fields that are used to accelerate and direct beams of electrons. Typically we would free the electrons from a surface by heating it up. One way is to run a current through a wire with resistance. The power dissipated in the wire causes it to increase its temperature to the point that it can radiate that power away, mostly carried off as light. The hot electrons escape the potential barrier at the surface and are "free" to use. Consider a source of electrons that is small, like a tiny hot filament. The electrons are freed from the surface but the positive charge they leave behind holds them in a cloud near the filament. Now we add another plate at voltage VV some distance dd away. We put a little hole in that plate to enable the electrons to zip on through. The experiment looks something like this. While they seem antiquated, the concept is still useful. It is the basis of modern X-ray tubes, and until only a few years ago all…Major Concepts - An object moving at a constant [Select] - A 10-kg object at rest that is 5 m above the ground will have a [Select] [Select] - equal to 0 J. will have a(n) [Select] - In projectile motion situations where air resistance is ignored, the The current through a [Select] [Select] of 0 m/s². equal to 500 J and a Electromagnetic radiation: Longer EM waves such as microwaves, radio, and infrared waves [Select] velocity (vx=Vox) is constant. circuit loop is the same everywhere and it doesn't get split at any junction. - Katie and Hasan have the same weight (60 N) and they run up the same flight of stairs that is 3 m high. Katie does it faster, though. Hasan used [Select] Katie because he took longer. shorter EM waves such as UV, x-rays, and gamma rays. - Freefall: If they are dropped from the same height and ignoring air resistance, a heavy object (such as a 350 kg piano) will fall to the ground [Select] a lighter object (such as a 15 kg television). - A 200 kg motorcycle moving…