Exam-style question
Try this first
What is the reference intensity used in the decibel scale?.
- A.1.0 W/m²
- B.1.0 x 10^-12 W/m²
- C.1.0 x 10^-6 W/m²
- D.1.0 x 10^-9 W/m²
Model answer
What a good answer should say
- 1.0 x 10^-12 W/m²
Explanation
Why this works
The reference intensity (I0) for the decibel scale is defined as 1.0 x 10^-12 W/m², which is the threshold of hearing for humans.
Common mistake
No common mistake is linked to this question yet.