4th Grade Science: Chapter 3 Lesson 1

Waves are around us all the time.

• True
• False

One back and forth motion causes one ___________ wave.

• disturbed
• complete
• incomplete

Light waves travel through _______ space.

• empty
• filled
• parallel

Other waves need a material, known as a _________, to travel through.

• average
• medium
• parallel

Frequency is the number of wave ____________ in a certain amount of time.

• occurances
• motions
• repetitions

A longitudinal wave is one that moves the _________ direction as the particles.

• same
• different

Longitudinal waves _______ and _______ as they travel.

• inflate, expand
• compress, expand

Waves are a _______ of energy.

• keeper
• transfer

Transfer means to relocate.

• True
• False