Giai cu nen W = Wd + Wt O Wt = W - Wa cu' LI' LI' 8 Vay chgn dap an D Cdu 17: Trong quang cua nguyen tuf hidro, neu biet h\idc song dai nhat cua vach quang day Laiman la X, i va h\i6c song cua vach ke vdfi no day la ^2 thi h\idc song cua vach quang day Banme l a : A (X,-^,)- c B + D Giai Difa vac scf chuyen mufc nSng Iifpng, ta c6: hfi = E i - E o (1) hf2 = E2 - Ee (2) hf„ = E2 - E l (3) E3- E2- K Ei- TrCf ve vdi ve (2) va (1) ta difpc: Eo- hf„ = hf2 - hfi 1-v he ^ he he V i hf = — nen — = he =>^„ = Vay chgn dap an B Cdu 18: Phat bieu nao sau day l a s a i k h i noi ve dao dong cua iSc dcfn (bo qua liic can cua moi triTdng)? A Vdri dao dong nho thi dao dong cua lac l a dao dong dieu h6a B K h i vat nang d vi tri bien, cd nang cua lac bang the nang cua n6 C Chuyen dong cua iSc tCf vi tri bien ve vi tri can bang la nhanh dan D K h i vat nang di qua vi tri can bang, thi ILTC tac dung len no can Vlng vdi life cSng cua day Giai Chi l e t d6 thi TS DH, CD Mdn V$t If