Physics Unit17: Electric Potential (id: ff231d4de)

本题目来源于试卷: Physics Unit17: Electric Potential，类别为 通用国际物理

[单选题]
An alpha particle (charge +2e, ma20 /ekm slx9,;xdsbi jss, 4o;oxws p/a 5w,wyeri;zaly3n,q tck6ia/ , $6.64\times {10}^{-27}kg$) moves head-on at a fixed gold nucleus (charge +79e). If the distance of closest approach is $2.0\times {10}^{-10}m$, what was the initial speed of the alpha particle?

A. $2.3\times {10}^{5}m/s$
B. $4.6\times {10}^{5}m/s$
C. $2.3\times {10}^{6}m/s$
D. $4.6\times {10}^{6}m/s$


参考答案:  A


本题详细解析: 暂无

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