推 ansonyu:有神快拜!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 01/13 01:21
推 sdg85732:好強!!感激!! 01/13 01:23
推 nerv3890:水歐 01/13 01:25
→ chieh0206: Q 是角度!!! 01/13 01:27
Y1=Asin(kx-wt)
Y2=Asin(kx+wt+Q)
Y1+Y2=2Asin(kx+Q/2)cos(wt+Q/2)
帶入 X=d
=> kd+Q/2=0 or pi or 2pi ......
=> Q=-2kd
所以 Y2=Asin(kx+wt-2kd) ...#
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