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"#$"% %()%GI K(&( %"I J=>$$GI K(&( %"I J4M$>=>$* V'&P &%& '&S(D?BC('Df$I KLHG9[U$4MHGQFU$*2"4"5$6(&( 7 $T$$(D$;<?X(Y2( 7'&2"4D E*Q *F *A 0*T TA ! "#$7a"% %& '&G %"I J kP(&( %$3I KHGA$$GI K(&( L$y P z( X% %"I J4M$>b%'&=>GA$*%"I J4Be(( "M?f?X(Y2(D?BC('DHGF U$*O$> 4Be( : K "% %*2"4"5$6O$>(&( 7'&$-( ! "8%.$3I KAGT$$(D E*7'&?@(F *7'&?@(9* *7`" XF* 0*7`" X9* 9 Gv: Nguyn Vn Lõm - Trc nghim c bn v súng ỏnh sỏng Câu 46. Trong thí nghiệm Young về giao thoa ánh sáng, khoảng cách giữa hai khe là a = 1mm, khoảng cách từ hai khe đến màn là D = 2m. Chiếu đồng thời hai bức xạ đơn sắc có bớc sóng $AGH à= và $FGH + à= vào hai khe thì thấy trên màn có những vị trí tại đó vân sáng của hai bức xạ trùng nhau. Khoảng cách nhỏ nhất giữa hai vị trí trùng nhau đó là: A. 4 mm B. 5 mm C. 6 mm D. 7,2 mm Câu 47. Trong một thí nghiệm Young với bức xạ có bớc sóng $FTGH à= , ngời ta đo đợc khoảng vân i là 0,42 mm. Thay bức xạ trên bằng bức xạ thì khoảng vân đo đợc là 0,385 mm. 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