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【简答题】
在宽度为a=0.60mm的狭缝后放置一焦距f=40cm的会聚透镜，若以单色平行光垂直照射狭缝，则在置于透镜主焦平面处的屏幕上x=1.4mm处的P点看到衍射明条纹，求 (1)入射光的波长以及P点衍射条纹的级数； (2)在该衍射条件下，缝面可分成的半波带数； (3)中央明条纹的宽度以及第二级明纹对应的衍射角。
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【简答题】A．He was housed by Emma Thompson five years ago. B．He has graduated from an England university. C．He has become a British citizen. D．He will be 15 years old in April.
【单选题】(Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).
A.
Even though
B.
has been studying
C.
to the United States
D.
to express himself
【简答题】电路如图所示。已知 RL= 5Ω,试求电路中的电流 I 。
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