  The absorption and emission problems of the brane-localized and bulk scalars
are examined when the spacetime is a $(4+n)$-dimensional Reissner-Nordstr\"{o}m
black hole. Making use of an appropriate analytic continuation, we compute the
absorption and emission spectra in the full range of particle's energy. For the
case of the brane-localized scalar the presence of the nonzero inner horizon
parameter $r_-$ generally enhances the absorptivity and suppresses the emission
rate compared to the case of the Schwarzschild phase. The low-energy absorption
cross section exactly equals to $4\pi r_+^2$, two-dimensional horizon area. The
effect of the extra dimensions generally suppresses the absorptivity and
enhances the emission rate, which results in the disappearance of the
oscillatory pattern in the total absorption cross section when $n$ is large.
For the case of the bulk scalar the effect of $r_-$ on the spectra is similar
to that in the case of the brane-localized scalar. The low-energy absorption
cross section equals to the area of the horizon hypersurface. In the presence
of the extra dimensions the total absorption cross section tends to be inclined
with a positive slope. It turns out that the ratio of the {\it missing} energy
over the {\it visible} one decreases with increase of $r_-$.
