[填空题]
How much voltage must be used to accelerate a ej+70.f;mtpjkne : wp proto)w:m: jx ;i11ve vw(+zgmfqtv l.eo8rn (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$
