一束具有两种波长[img=17x22]1803a11548d0e77.png[/img]和[img=17x22]1803a115517c7e0.png[/img]的平行光垂直照射到一衍射光栅上,测得波长[img=17x22]1803a11548d0e77.png[/img]的第三级主极大衍射角和[img=17x22]1803a115517c7e0.png[/img]的第四级主极大衍射角均为30°。已知[img=17x22]1803a11548d0e77.png[/img] = 5600 Å,试问光栅常数a+b= 及波长[img=17x22]1803a115517c7e0.png[/img]= 。
A: [img=113x24]1803a1157cd743d.png[/img],3800 Å
B: [img=113x24]1803a1157cd743d.png[/img],4200 Å
C: [img=113x24]1803a1158ef7660.png[/img],4200 Å
D: [img=113x24]1803a1158ef7660.png[/img],3800 Å
A: [img=113x24]1803a1157cd743d.png[/img],3800 Å
B: [img=113x24]1803a1157cd743d.png[/img],4200 Å
C: [img=113x24]1803a1158ef7660.png[/img],4200 Å
D: [img=113x24]1803a1158ef7660.png[/img],3800 Å
举一反三
- 一束具有两种波长[img=17x22]180395f1bb935fc.png[/img]和[img=17x22]180395f1c42fe96.png[/img]的平行光垂直照射到一衍射光栅上,测得波长[img=17x22]180395f1bb935fc.png[/img]的第三级主极大衍射角和[img=17x22]180395f1c42fe96.png[/img]的第四级主极大衍射角均为30°。已知[img=17x22]180395f1bb935fc.png[/img] = 5600 Å,试问光栅常数a+b= 及波长[img=17x22]180395f1c42fe96.png[/img]= 。 A: [img=113x24]180395f1eda55a1.png[/img],3800 Å B: [img=113x24]180395f1eda55a1.png[/img],4200 Å C: [img=113x24]180395f1fe48891.png[/img],4200 Å D: [img=113x24]180395f1fe48891.png[/img],3800 Å
- 一束具有两种波长λ1和λ2的平行光垂直照射到一衍射光栅上,测得波长λ1的第三级主极大衍射角和λ2的第四级主极大衍射角均为30°。已知λ1 = 5600 Å,试问光栅常数a+b及波长λ2 A: [img=113x24]1803a1160621f64.png[/img],3800 Å B: [img=113x24]1803a1160f9eafc.png[/img],4200 Å C: [img=113x24]1803a11617b2c7b.png[/img],4200 Å D: [img=113x24]1803a116202a439.png[/img],3800 Å
- 一束具有两种波长λ1和λ2的平行光垂直照射到一衍射光栅上,测得波长λ1的第三级主极大衍射角和λ2的第四级主极大衍射角均为30°。已知λ1 = 5600 Å,试问光栅常数a+b及波长λ2 A: [img=113x24]180344826dd1982.png[/img],3800 Å B: [img=113x24]1803448275b281e.png[/img],4200 Å C: [img=113x24]180344827e91a89.png[/img],4200 Å D: [img=113x24]1803448286a8398.png[/img],3800 Å
- 设总体X的分布律为P(X=0)=θ, P(X=1)=P(X=2)=(1-θ)/2,其中0<θ<1为待估未知参数。设[img=101x23]1802d3c6e1c13c2.png[/img]是简单随机样本。令[img=114x27]1802d3c6e985317.png[/img],[img=17x22]1802d3c6f1a9682.png[/img]为[img=101x23]1802d3c6e1c13c2.png[/img]中0所占的比例, 则以下哪个说法正确的? A: [img=17x22]1802d3c702e42ee.png[/img]比[img=17x22]1802d3c70bb0618.png[/img]更有效 B: [img=17x22]1802d3c70bb0618.png[/img]和[img=17x22]1802d3c702e42ee.png[/img]都是[img=9x19]1802d3c72407a68.png[/img]的相合估计 C: [img=17x22]1802d3c70bb0618.png[/img]比[img=17x22]1802d3c702e42ee.png[/img]更有效 D: [img=17x22]1802d3c70bb0618.png[/img]是相合估计, [img=17x22]1802d3c702e42ee.png[/img]不是相合估计 E: [img=17x22]1802d3c70bb0618.png[/img]不是相合估计, [img=17x22]1802d3c702e42ee.png[/img]是相合估计 F: [img=17x22]1802d3c70bb0618.png[/img], [img=17x22]1802d3c702e42ee.png[/img]都不是相合估计 G: [img=242x46]1802d3c7710420a.png[/img]
- a,b为任意常数,且a[img=14x23]1803bbe371f8955.png[/img]0,则有D([img=10x14]1803bbe37a44e5d.png[/img]X +b)=[img=17x22]1803bbe3820329a.png[/img]D(X)