Rarefaction

High school (ages 12+)
Science & Technology

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/rarefaction

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. What is the physical state?A state of reduced density and pressure in a medium
2. What is the wave dynamics?Characterized by self-similar expansion, maintaining profile over time
3. How does rarefaction happen in a sound wave?In a sound wave, rarefaction follows a compression; the air particles spread out after being pushed together, creating a low‑pressure part of the wave.
4. Why do rarefaction waves spread out instead of getting sharper?Because the higher pressure behind the wave pushes the lower pressure ahead, the wave expands and keeps its shape, unlike compression waves that can steepen into shock fronts.

Density: Mass per unit volume, indicating the concentration of matter within a substance.
Medium: The substance or material through which a wave propagates, such as air, water, or solids.
Self-similar expansion: A process where a wave or structure grows in size while retaining its proportional characteristics.