Sound intensity level
from class:
College Physics II – Mechanics, Sound, Oscillations, and Waves
Definition
Sound intensity level is a logarithmic measure of the sound intensity relative to a reference value, typically measured in decibels (dB). It quantifies how loud a sound is perceived.
congrats on reading the definition of sound intensity level. now let's actually learn it.
5 Must Know Facts For Your Next Test
- Sound intensity level is measured in decibels (dB).
- The reference sound intensity is usually $1 \times 10^{-12}$ W/m², which corresponds to the threshold of hearing.
- Sound intensity level is calculated using the formula $$L_I = 10 \log_{10} \left(\frac{I}{I_0}\right)$$ where $I$ is the sound intensity and $I_0$ is the reference intensity.
- A doubling of sound intensity results in an increase of approximately 3 dB in the sound intensity level.
- The human ear perceives a 10 dB increase in sound intensity level as roughly twice as loud.
Review Questions
- What unit is used to measure sound intensity level?
- How does doubling the sound intensity affect the sound intensity level?
- What is the reference sound intensity ($I_0$) commonly used when calculating sound intensity level?
"Sound intensity level" also found in:
© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.