# reverberation time

> time after which the sound energy density has fallen to a certain fraction of the initial value after the sound source has stopped emitting

**Wikidata**: [Q606646](https://www.wikidata.org/wiki/Q606646)  
**Source**: https://4ort.xyz/entity/reverberation-time


## References

1. ISO 80000-8:2020 Quantities and units — Part 8: Acoustics
2. ISO 80000-8:2007 Quantities and units—Part 8: Acoustics