From Wikipedia, the free encyclopedia

	Portal This article is within the scope of WikiProject Physics, which collaborates on articles related to physics.
B	This article has been rated as B-Class on the assessment scale.
Mid	This article is on a subject of mid importance within physics.
Help with this template This article has been rated but has no comments. If appropriate, please review the article and leave comments here to identify the strengths and weaknesses of the article and what work it will need.

	This article is part of WikiProject Electronics, an attempt to provide a standard approach to writing articles about electronics on Wikipedia. If you would like to participate, you can choose to edit the article attached to this page, or visit the project page, where you can join the project and see a list of open tasks.
???	This article has not yet received a rating on the quality scale.
???	This article has not yet received a rating on the importance scale.

[edit] B-class

I've tagged this article as B-class because it nees cleanup for encyclopedic tone. The current text is a mix of conversational tone, for example starting a sentence with "anyway", and textbook or journal-article tone, mainly in the large amount of equations relative to text. -- The Photon 03:02, 13 April 2007 (UTC)