| A | B |
|---|
| most important source of electromagnetic waves | sun |
| electromagnetic waves do NOT need a ____ | medium |
| electromagnetic waves can be ___ to different energy | changed |
| waves of electrical and magnetic fields | electromagnetic |
| sound waves begin with ___ matter | vibrating |
| sound waves are ___ waves | longitudinal |
| ___ waves MUST have a medium | sound |
| all electromagnetic waves have same ___ across space | speed |
| energy of electromagnetic waves depends on ___ | energy |
| EM waves with long wavelengths have ___ frequency | low |
