Bulletin of Pure and Applied Sciences: Physics (Yearly): Vol.29 Issue.1 Jan-June 2010 - National - Delhi Bulletin of Pure and Applied Sciences Jan-June 2010 - 29 . 2009: Vol.28-D Issue No.2 July - Dec'2009 ISSN: 9070-6569 Subjects--Topical Terms: Physics Subjects--Facted Index Terms: BulletinPureAppliedSciences:Physics(Yearly):Vol.29Issue.1Jan-June2010Physics