TCAP Science Grade 8 Practice Questions - Tennessee Comprehensive Assessment Program (TCAP) Science, Grade 8 Exam

Why can light waves travel through outer space, but sound waves cannot?

Light waves are electromagnetic waves, whereas sound waves are mechanical waves requiring a medium. Light waves travel much slower than sound waves in a vacuum. Sound waves have too much energy to travel through a vacuum. Outer space is too cold for sound waves to move.

Correct Answer:

Light waves are electromagnetic waves, whereas sound waves are mechanical waves requiring a medium.

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