[".,파장=주파수* D\nD파도속=DD
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选择题： 频率为的驻波,若其相邻两波节间的距离为d,则该驻波的波长和波速分别是（ ） A. d d B.2d d C.d 2d D.2d 2d 答案：D 提示：能阐述出解题过程的给予额外奖励，答案回复可见！
D，波长2D，波速=频率*波长=2Dv
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