A sound wave has a sound pressure level of $134 \text{ dB SPL}$. Calculate the RMS sound pressure in Pascals ($\text{Pa}$). (Use reference pressure $p_0 = 2.0 \times 10^{-5} \text{ Pa}$ and $\text{dB SPL} = 20 \log_{10} \left( \frac{p}{p_0} \right)$)