Question Detail
Question
What is the standard reference intensity (I₀) used in the decibel scale for sound intensity measurements?
Correct Answer
Option B is the correct answer.
Detailed Explanation
The text explicitly states: 'I₀ is about 10⁻¹² W / m².' This is the standard reference intensity for calculating loudness in decibels.
Hint
Look for the specific value of I₀ mentioned in the context of the decibel formula introduction.