本题目来源于试卷: Physics Unit17: Electric Potential，类别为 国际高中通用物理
[单选题]
An alpha particle (charge +2e, g( xllv e3)1f,z 6,iyo.stvkfq :n- aiaovhu3k4s9ul 5 0t bv/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
| 
