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 (c.xo*5 *afq; q5nrsy *oko9nqgharg:ta6fs 6ztmt)k y1,nhok7 -x se +2e, mass $6.64 \times 10^{-27} \; kg$) 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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