[填空题]
(a) What is the fractio. a9b86,1htvl k, e0ul wmlqmcn of thryq;u hap 2*,fa2 sumnvuib+9-p3* zfe hydrogen atom's mass that is in the nucleus? $\dfrac{m_{\text{p}}}{(m_{\text{p}} + m_{\text{e}})}$ =
(b) What is the fraction of the hydrogen atom's volume that is occupied by the nucleus? $\left( \dfrac{r_{\text{nucleus}}}{r_{\text{atom}}} \right)^3$ = $ \times 10^{-14}$
