National Science Digital Library

NSDL's broad objective is to provide curriculum based contents for under graduate science students. In addtion to NSDL's own content which have been created through a meticulous content creation process, additional resources that are deemed to be relevant for undergraduate students have been identified. All the books in this Community have been downloaded from www.lightandmatter.com and are licensed under the Creative Commons Attribution-ShareAlike license, version 3.0, http://creativecommons.org/licenses/by-sa/3.0/, except for those photographs and drawings as listed in the photo credits. If you agree to the license, it grants you certain privileges that you would not otherwise have, such as the right to copy the book, or download the digital version free of charge from.