00265nam a22001217a 4500020001800000082001200018100001900030245002200049260003400071300001000105650001200115650001600127  a9788120344343  a530 SAS  akumar,Sasi.P.R  aPractical physics  aNew DelhibPHI Learningc2011  a328 p  aphysics  aexperiments