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waves
| Question | Answer |
|---|---|
| include sound | compressional |
| need a medium | compressional |
| back and forth energy moves forward | compressional |
| include light | transverse |
| doesn't need a medium | transverse |
| up and down energy moves forward | transverse |
| displace energy | both |
| CAN displace matter | both |
| have wave lengths | both |