Fact 1: Matter vibrating can cause sound.

Fact 2: Intensity , or loudness of sound, is measured in decibels .

Given the two facts above, answer the question "What unit is used to measure the intensity of matter vibrating?" with the following options: 
- Joules
 - mechanical
 - Nanometers
 - Decibels
 - Hertz
 - waves
 - power
 - a prism


 

    Decibels     