00381nam a22001577a 450000500170000000800410001702000260005804000090008404100120009308200170010510000170012224500270013926000280016630000080019465000210020220260603132743.0260603b        |||||||| |||| 00| 0 eng d  a9788178805900c900.00  aMAIN  aEnglish  a530.416bGUP  aGupta, Nisha  aWaves And Oscillations  aNew Delhi bRajatc2012  a299  aPhysics (PM USHA