From WikiChip
Editing mean free time
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
This page supports semantic in-text annotations (e.g. "[[Is specified as::World Heritage Site]]") to build structured and queryable content provided by Semantic MediaWiki. For a comprehensive description on how to use annotations or the #ask parser function, please have a look at the getting started, in-text annotation, or inline queries help pages.
Latest revision | Your text | ||
Line 4: | Line 4: | ||
== Overview == | == Overview == | ||
[[Charge carriers]] in a material are in random thermal motion with average velocity <math>\langle v \rangle</math>. When an electric field <math>E</math> is applied, the carriers acquire [[drift velocity]] <math>v_d</math> in the same direction, opposite to the field. Constant collisions with lattice ions means that the the gained kinetic energy is lost pretty frequently. The '''mean free time''' <math>\tau</math> is the average time before a randomly picked electron makes it next collision. Note that collisions are random, so <math>\tau</math> does not depend on the elapsed time since prior collision. | [[Charge carriers]] in a material are in random thermal motion with average velocity <math>\langle v \rangle</math>. When an electric field <math>E</math> is applied, the carriers acquire [[drift velocity]] <math>v_d</math> in the same direction, opposite to the field. Constant collisions with lattice ions means that the the gained kinetic energy is lost pretty frequently. The '''mean free time''' <math>\tau</math> is the average time before a randomly picked electron makes it next collision. Note that collisions are random, so <math>\tau</math> does not depend on the elapsed time since prior collision. | ||
− | |||
− | |||
− | |||
− | |||
− | |||
{{stub}} | {{stub}} |