[填空题]
How much voltage must be ; f uwdniv.(suxt)aq t8jc-)) used to acceler6/wxvj x k88dur)f5fn e/ 9mujate a proton (radius $1.2 \times10^{-15 }\,m$) so that it has sufficient energy to just penetrate a silicon nucleus? A silicon nucleus has a charge of $+14e$, and its radius is about $ 3.6\times10^{-15 }\,m$. Assume the potential is that for point charges. $ \times10^{6 }\,V$
