Ambient noise level

High school (ages 12+)
Environment & Earth

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/ambient-noise-level

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How heavy is Ambient noise level?A-weighting (dB(A)), which approximates human hearing sensitivity
2. What is the reference sound pressure?20 μPa (micropascals) in SI units, representing the faintest audible sound
3. What is the primary measurement unit?Decibels (dB), a logarithmic scale for sound pressure level
4. How do scientists measure ambient noise?They use a sound level meter that records sound pressure and shows the level in decibels, a scale that lets us compare very quiet and very loud sounds.
5. Why do we use A‑weighting when measuring noise?A‑weighting adjusts the reading to match how our ears hear different pitches, so the measurement reflects what we actually feel.

Sound pressure level (SPL): A logarithmic measure of the effective pressure of a sound relative to a reference value.
Frequency weighting: A filter applied to sound measurements to account for the non-linear frequency response of human hearing.
Sound contour map: A graphical representation showing the spatial distribution of sound levels in an area.