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Chùm tia tới lăng kinh vuông góc với màn Tinh chiề u ̉ ́ ́ ́ ́ rô ̣ng của quang phổ quan sát đươ ̣c trên màn a 0,097 mm b 0,97 mm c 9,77 mm d 0,79 mm 134 Hai lò xo có độ cứng k1, k2 , có chiều dài bằng nhau Khi treo vật khối lượng m vào lò xo k1 thì chu kỳ dao động của vật là T1 = 0,3 s Khi treo vật vào lò xo k2 thì chu kỳ dao động của vật là T2 = 0,4 s Khi treo vật vào hệ hai lò xo nối nhau... thấ u kinh thì ảnh di chuyể n cùng chiề u với vâ ̣t vì (II) ́ ́ Công thức vi trí 1/d + 1/d’ = 1/f cho thấ y d’ nghich biế n với d ̣ ̣ a Hai hát biểu đều đúng và có tương quan b Hai hát biểu đều đúng và không tương quan c Phát biểu l đúng, phát bíểu II sai d Phát biểu I sai, phát biểu II đúng Công thức nào sau đây không được dùng để tính chu kỳ dao động của con lắc lò xo? a T = 2π m k b... = 2gl(cos α − cos αo ) c v = gl(cos α − cos αo ) d v = 2gl( cos α - cos α 0 ) 132 (I) Nếu nhiệt độ không thay đổi, càng lên cao chu kỳ dao động của con lắc đơn càng tăng; (II) Vì gia tốc trọng trường nghịch biến với độ cao Chọn: a Hai hát biểu đều đúng và có tương quan b Hai hát biểu đều đúng và không tương quan c Phát biểu l đúng, phát bíểu II sai d Phát biểu I sai, phát biểu II đúng o 133 Mô ̣t lăng... mm, ta thấy có : a Vân sáng bậc 5 b Vân sáng bậc 4 c Vân tối bậc 6 d Vân tối bậc 4 150 (I) Để có ảnh rõ nét, mă ̣t phản xa ̣ của gương cầ u phải là mă ̣t phẳ ng vì (II) Để có ảnh rõ nét, gương cầ u phải có góc mở rấ t nhỏ a Hai phát biểu đều đúng và có tương quan b Hai hát biểu đều đúng và không tương quan c Phát biểu l đúng, phát bíểu II sai d Phát biểu I sai, phát biểu II... lượng m vào lò xo k1 thì chu kỳ dao động của vật là T1 = 0,3 s Khi treo vật vào lò xo k2 thì chu kỳ dao động của vật là T2 = 0,4 s Khi treo vật vào hệ hai lò xo nối nhau một đầu thì chu kỳ dao động của vật là: a 0,35 s b 0,5 s c 0,7 s d 0,24 s 135 Một chất điểm dao động điều hòa với phương trình x = 6sin(π t + π/2) cm Ở thời điểm t = ½ s chất điểm ở vị trí nào, có vận tốc bằng bao nhiêu? a x = 0, v = . -&O 2u(5C,&O 2u(• FF  &P%Q5(4+không !_%-Wu j&%&(At-T%d%.w%.VBR  : A

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