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2 wave superposition (with phase & group velocity)
Author:
董其桓
以下是兩個波的疊加,紅色(ω1,k1)與藍色(ω2,k2)疊加形成黑色的波,而紫色的波是angular frequency = (ω2- ω1)/2,wave number = (k2-k1)/2 形成的包絡線,用來描述波包行進。 E點與F點分別以群速度與相速度前進,可看出群速度即為波包移動的速度
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