※ 引述《ekira111 (YU)》之銘言:
: 【出處:半導體老師給的題目
: 【題目】Mobility(u) is define as:Vd=uE, where Vd is drift velocity and E
: is electric field. prove that u has the same unit as q(Tau)/m*
: (我不曉得Tau要怎麼在這打), where q is electronic charge,(Tau)is mean free
: time, and m* is effective mass
: 【瓶頸】老師只給了答案u單位是cm^2/V*s,這邊的話我用Vd=uE能算出來
: 但用q(Tau)/m*就無法
: q單位是C,Tau是s,m*是g,這樣算出來是(C*s)/g
: 實在不知道是哪裡錯了,查了wiki單位應該沒錯
[Vd] / [E]
= [L][q][T]^2 / [T][M][L]
= [q][T] / [M]
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