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【简答题】
阅读理解。 Sue is 13 years old today. She has a birthday party. Her friends Amy, Lily and Kate come to her home. Sue: Sit down and have a cup of tea. Her friends: Thank you. Happy birthday, Sue. Amy: Here is a cake for you. I'm sorry it's too small. The shop doesn't sell the big ones and Lily likes it very much. Lily: I made a card for you. Happy birthday to you, Sue. Kate: Sue, this hat is my present for you, do you like it? Sue: Thank you very much. I like all of your presents for me. Let's sing and eat the cake. (They jump with joy and begin the birthday party.) 1. Whose birthday is it? A. Kate. B. Sue. C. Amy. 2. Who made a card for Sue? A. Lily. B. Kate. C. Amy. 3. Who gives a hat to Sue? A. Lily. B. Kate. C. Amy. 4. Who gives a cake to Sue? A. Kate. B. Lily. C. Amy. 5. What does Sue like? A. The card. B. The hat and the cake. C. A and B.
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【单选题】波长为 λ 的单色光垂直入射于光栅常数为 d 、缝宽为 a 、总缝数为 N 的光栅上.取k=0,±1,±2....,则决定出现主极大的衍射角q的公式可写成
A.
Na sinθ ＝ k λ ．
B.
a sinθ ＝ k λ ．
C.
Nd sinθ ＝ k λ ．
D.
d sinθ ＝ k λ ．
【单选题】波长为λ的单色光垂直入射于光栅常数为d、缝宽为a、总缝数为N的光栅上。取k=0,±1,±2...,则决定出现主极大的衍射角θ的公式可写成
A.
asinθ=kλ
B.
dsinθ=kλ
C.
Nasinθ=kλ
D.
Ndsinθ=kλ
【单选题】波长为λ的单色光垂直入射于光栅常数为d、缝宽为a、总缝数为N的光栅上．取k=0，±1，±2，…，则决定出现主极大的衍射角θ的公式可写成( )．
A.
Nasinθ=kλ
B.
asinθ=kλ
C.
Ndsinθ=kλ
D.
dsin0=kλ
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A.
± 1级， ± 3级
B.
± 2级， ± 4级， 0级
C.
± 2级， ± 4级，
D.
± 1级， ± 3级，0级
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【单选题】波长为λ的单色光垂直入射于光栅常数为 d 、缝宽为 a 、总缝数为 N 的光栅上。取 k = 0 ,± 1 ,± 2 ...,则决定出现主极大的衍射角θ 的公式可写成
A.
Nasinθ=kλ
B.
asinθ=kλ
C.
Ndsinθ=kλ
D.
dsinθ=kλ
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