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30. 當我們利用一電位差 V 來加速一個質量為 m、電荷為- e 的靜止電子後,再利用一垂直於其速度的磁場B加以偏折。請問此電子偏折軌跡的半徑為:(A) (B)(C) (D)
問題詳情
30. 當我們利用一電位差 V 來加速一個質量為 m、電荷為- e 的靜止電子後,再利用一垂直於其速度的磁場B加以偏折。請問此電子偏折軌跡的半徑為:
(A)
(B)
(C)
(D)
參考答案
答案:C
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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9. Many homemakers do not have a chance to _____ a career until their children are older.(A) fasten(
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17. People enjoy a______ life span than before.(A) longest (B) long (C) the longer (D) longer
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18. The little girl got lost.______ what to do, she started to cry.(A) Not knowing (B) Not known (C)
9. The researcher said that it ______patience and perseverance to finish the research.(A) got (B) to
20. Every morning, my grandfather ______ his jacket before going outside to get the newspaper.(A) pu
11. There are many interesting places to visit in NYC. The art museum, ______, has an excellentcolle
2. Because they are ______, wolves hunt large animals such as deer and elk.(A) herbivorous(B) carniv
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11.______ finishing his project, he went to bed.(A) Owing (B) Be (C) Afterwards (D) After
18、小名家鄉的地形起伏如圖五所示。請問:圖五中虛線最可能為何種地表景觀?(A)湖泊(B)山脊(C)河川(D)斷層。
13. In the season of autumn, ______ leaves on the ground seem to add more colors to Nature.(A) fall(
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47. 通過一電感的電流以120安培/秒變化時,其自感應電動勢為12伏特,求其自感為多少亨利?(A) 0.1 (B) 1.2 (C) 10 (D) 12
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22. Hoping to excuse my lateness, _______.(A) I wrote a note and gave it to my teacher(C) my teacher
14. This English dictionary is the one upon ______ I depend when learning new words.(A) which(B) tha
5. The emotional toll from a(n) ______ event can cause intense, confusing and frightening emotions.(
48. 變壓器是一種用來改變交流電壓高低的裝置,是依據下列哪個定律?(A) 庫倫定律 (B) 必歐–沙伐定律(C) 安培右手定律 (D) 法拉第感應定律