求助！
1. Given the relation:ω=α^2 β^1/3
ω is angular frequency and β is propagation constant.
(a) Calculate the phase velocity.
(b) Calculate the group velocity.
(c) Derive an expression for dispersion parameter D.
Note: is a constant.
谢谢！ 传播常数和角频率给了，求相速度和群速度，好像有公式吧，记不清了
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