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4. _____ energy is required to make waves at a higher frequency.
7. The _____ is the lowest point of a wave on a graph.
8. A wave travels through space and _____ in a regular, oscillating fashion.
9. Electromagnetic radiation is typically classified by its _____.
10. The energy of light travels through a medium called an _____ field.
14. Earthquakes shake the ground with _____ waves.
17. Longer waves have less _____.
18. energy forms may be measured by their frequencies as well as by their _____.

1. A wave is a _____ that moves energy from one place to another.
2. Middle C has a frequency of 261.6 _____.
3. Gamma rays are at a _____ frequency.
5. To _____ is to swing back and forth with a steady, uninterrupted rhythm.
6. Radio Waves are a part of the electromagnetic _____.
11. _____ is one of the three major ways that energy is transferred.
12. _____ light is considered a longer-wavelength radiation as microwaves and radio waves.
13. Frequency and period are _____ of one another.
15. Sound travels with both amplitude and frequency which may be _____.
16. The spectrum of electromagnetic radiation ranges from _____ waves to gamma rays.