TY - BOOK AU - Beiser, Arthur TI - Concepts of modern physics SN - 0070043634 U1 - 539 PY - 1973/// CY - New Delhi PB - Mcgraw Hill Kogakusha limited KW - Physics KW - Relativity KW - Twin paradox KW - Velocity addition KW - Mass and energy KW - Properties of waves ER -