题目内容
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Ec = Fermi energy, EF = Conduction band edge
提问人：网友hhhh7133
发布时间：2022-01-07
题目内容
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第3题
A light propagates from medium 1 to medium 2. To realize the total internal reflection (TIR), the refractive indices of n1 and n2 should satisfy ( ).
A、n1>n2
B、n1<n2>
C、n1=n2
D、n1=0
第4题
Ruby laser is a ( ).
A、Three-level system
B、Four level system
C、Two level system
D、Five level system
第5题
For two energy levels where E1 <e2, if n1 and n2 are the populations of electrons on e1 e2 respectively, population inversion means (> A、N1>N2
B、N1 <n2>
C、N1=N2
D、N2=0
第6题
The photon of the stimulated emission of atoms is similar to that of the incoming photon in the following ways ( ). ①same frequency ② the divergence angle ③ the same phase ④the polarization ⑤the propagation direction
A、①②③④
B、①③④⑤
C、①②③
D、③④⑤
第7题
Which is a heterojunction ( ).
A、a pn junction with Eg1= Eg2=0
B、a pn junction with Eg1= Eg2=0.9 eV
C、a pp junction with Eg1=0.7 eV and Eg2=0.9 eV
D、a pn junction with Eg1= Eg2=1.1 eV
