The Electromagnetic Spectrum (Part 3)

What You'll Learn

Sound is a vibration that travels through matter as a wave. It cannot travel through a vacuum. Sound travels fastest through solids and slowest through gases.

Key Words

model
prototype

Materials Needed

markers
popsicle sticks
pennies

Safety First

Wear safety goggles when mixing liquids.

Steps

Step 1 — Read

Review the background information on Data and Evidence before starting.

Step 2 — Do

Design an experiment to test a hypothesis. Identify your independent variable, dependent variable, and controls. Run the experiment and present results.

Step 3 — Observe

Note any unexpected results and think about why they happened.

Step 4 — Record

Share your findings with the class or a partner and discuss what you learned.

Check Your Understanding

Question 1

1 of 3

What determines the pitch of a sound?