^ 27t 27C_ 2;i q = Q o C O S — t , =>i, = - — Q o S i n — t , (1) Doi v d i mach thuf h a i k h i t2 dien t i c h c6 Idfn la q t a c6: ^ 271 q = QoCOS—t, Vi q = ^ QoCOS 2n ^ —t, 2n ^ 271 QoSin—12 2n litt =QoSin — t j ^ — ^ ^2 h ^1 (2) 27rt, 27t = — - = ^ s i n — t , h M 27t =sin — ^2 271 The vao ( ) va ( ) t a dtrdc: ^ = - x ^ = = • h 2_7C T, Vay chgn dap an A Cdu 26: Theo t i e n de ciia Bo, k h i electron t r o n g nguyen tijf h i d r o chuyen tii quy dao L sang quy dao K t h i nguyen tuf p h a t r a p h o t o n c6 song biTdc , k h i electron chuyen til quy dao M sang quy dao L t h i nguyen tijf phat r a p h o t o n c6 birdfc song X,,, va k h i electron chuyen tCf quy dao M sang quy dao K t h i nguyen tuf p h a t p h o t o n c6 budfc song X , Bieu thufc xac d i n h A.,, l a : A- = '' • = ? l -A.21 B X31 D A,3, = Aj, -A.32 C X31 =A,32+>t2, ^32 '^21 Giai K h i electron chuyen dpng: he - tCr quy dao L sang K: — = E L - E ^ (1) ^21 he - tCr quy dao M sang L : — = E,^ - (2) he - tii quy dao M sang K: — = E ^ - E ^ (3) ^31 TCf ( l ) , ( ) v a ( ) suy ra; — ^31 = — ^32 +— « ^21 , X,, = X X 21 ^32 "^^21 Vay chgn dap an D Giai Chi tiet de thi T S OH C D M6n Vat li 67