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As Part 1 introduces, we get decibel using the formula $$ l = 10 \times log \frac{p_1}{p_2} (dB) $$ I'd blame my poor English ability that I didn't...
Most people know that dB (decibel) is a unit, you use it when you want to tell the level of a sound. People could say, the sound of a jet engine can...
