\textbf{168.} A sound device with sound level $\beta_1 = 28\,\text{dB}$ and another sound device with sound level $\beta_2 = 92\,\text{dB}$ produce sound together. The intensities corresponding to these two levels are $I_1$ and $I_2$ respectively $\left(\dfrac{W}{m^2}\right)$. What is $\dfrac{I_2}{I_1}$? $(\log 2 = 0.3)$
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(1) $2.5\times10^6$ \hspace{1cm} (2) $2.5\times10^8$ \hspace{1cm} (3) $4\times10^6$ \hspace{1cm} (4) $4\times10^8$
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