A noise meter located at a distance of $30 \mathrm{~m}$ from a point source recorded $74 \mathrm{~dB}$. The reading at a distance of $60 \mathrm{~m}$ from the point source would be

A noise meter located at a distance of $30 \mathrm{~m}$ from a point source recorded $74 \mathrm{~dB}$. The reading at a distance of $60 \mathrm{~m}$ from the point source would be

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