  The frequency spectra of the entropy and kinetic energy along with the power
spectrum of the thermal flux are computed from direct numerical simulations for
turbulent Rayleigh-B\'{e}nard convection with uniform rotation about a vertical
axis in low-Prandtl-number fluids ($\mathrm{Pr} < 0.6$). Simulations are done
for convective Rossby numbers $\mathrm{Ro} \ge 0.2$. The temporal fluctuations
of these global quantities show two scaling regimes: (i) $\omega^{-2}$ at
higher frequencies for all values of $\mathrm{Ro}$ and (ii)
$\omega^{-\gamma_1}$ at intermediate frequencies with $\gamma_1 \approx 4$ for
$\mathrm{Ro} > 1$, while $4 < \gamma_1 < 6.6$ for $0.2 \le \mathrm{Ro} < 1$.
