【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。
【简答题】利用波长为λ=0.59μm的平行单色光照射光栅,已知光栅上每毫米宽度内刻500条狭缝,透光狭缝宽度a=1×10 -3 mm.试求:
【单选题】PartI Vocabulary & Structure ( 25 points, 1 point for each item) Se c tion A Directions: There are 15 incomplete statements here. Complete each statement by choosing the appropriate answer from the 4 ...
【单选题】光强度与单色器狭缝宽度有关,定量分析时采用的狭缝宽度
【单选题】Choose the best item to complete each of the following sentences. 7. He always ______ the latest fashions.
【单选题】Directions: Listen to the news item and complete the following summary. Choose the best answer to complete each of the following sentences. [音频] This news item is about 1) ________.
A.
the violent protest over voting problems in Yemen
B.
the local council election in Yemen
C.
the ruling General People's Congress Party in the lead
D.
the people killed and injured during the voting in Yemen
【单选题】单色光的纯度可用仪器的狭缝宽度调节,宽度增加将会使( )
【单选题】Choose the best item to complete each of the following sentences. 1、 There’s no supermarket in the _____ area.
【单选题】Choose the best item to complete each of the following sentence. 6.This sentence doesn't make any______.