How does sound get through objects, through the air, to your ears?
Well, sound is a form of energy that travels through materials by making particles in the materials vibrate.
When the particles are packed together tightly (making the material dense), the sound waves travel easily and quickly.
In materials where the particles are spread far apart, for example, gases at room temperature, the sound waves do not travel as quickly.
Got that?
Let's test this out with some questions now.
View the activity introduction for more information on the topic
Read the question aloud
Open the accessibility toolbar to change fonts and contrast, choose a different language, use a ruler and more
Question
Do you want to skip questions and finish?
Hold up, it looks like there may be an issue with your spelling. Why not try it again?
You need to check your answer before you proceed. Are you sure you want to skip?
Teacher explanation