圆孔的夫琅禾费衍射形成的艾里斑的角半径是
A: [img=29x25]18035c948b5e807.png[/img]
B: [img=61x25]18035c949357c17.png[/img]
C: [img=75x25]18035c949c06276.png[/img]
D: [img=61x25]18035c94a560d8c.png[/img]
A: [img=29x25]18035c948b5e807.png[/img]
B: [img=61x25]18035c949357c17.png[/img]
C: [img=75x25]18035c949c06276.png[/img]
D: [img=61x25]18035c94a560d8c.png[/img]
举一反三
- 圆孔的夫琅禾费衍射形成的艾里斑的角半径是 A: [img=29x25]18033a9f614b7c9.png[/img] B: [img=61x25]18033a9f6a32b99.png[/img] C: [img=75x25]18033a9f72e1089.png[/img] D: [img=61x25]18033a9f7c432c8.png[/img]
- 设D(X)=25,D(Y)=36,[img=58x17]17e0bcfc3a8fb71.jpg[/img],则D(X+Y)=( ) A: 61 B: 85 C: 37 D: 57
- 随机变量 X 服从均匀分布[img=296x96]17de89393460b92.png[/img]则D(X)=( ). A: 4.5 B: 25/12 C: 1/5 D: 1
- 独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da13460ecf5.png[/img][img=36x43]1803da134eadb99.png[/img][img=57x43]1803da135709664.png[/img]…[img=58x43]1803da135e5a076.png[/img]… D: X123…k…P[img=9x43]1803da13671cd55.png[/img][img=36x43]1803da13703c21c.png[/img][img=57x43]1803da1378489ec.png[/img]…[img=58x43]1803da13822269c.png[/img]…
- 独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803573572a7b80.png[/img][img=36x43]180357357af3976.png[/img][img=57x43]180357358399321.png[/img]…[img=58x43]180357358bf0f84.png[/img]… D: X123…k…P[img=9x43]180357359488348.png[/img][img=36x43]180357359c7d68a.png[/img][img=57x43]18035735a57969a.png[/img]…[img=58x43]18035735ae0e3f4.png[/img]…