元素的特征光谱中含有波长分别为 l 1 = 450 nm 和 l 2 = 750 nm (1 nm = 10 -9 m) 的光谱线.在光栅光谱中,这两种波长的谱线有重叠现象,重叠处 l 2 的谱线的级数将是 :
A.
3 , 6 , 9 , 12 ......
B.
2 , 5 , 8 , 11 ......
C.
2 , 4 , 6 , 8 ......
D.
2 , 3 , 4 , 5 ......
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