Here is the identification of each statement regarding electromagnetic waves, mechanical waves, or both:
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The waves can only travel through a physical medium.
- Mechanical Waves
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The waves can travel through a vacuum and a physical medium.
- Electromagnetic Waves
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The frequency of the waves is proportional to their wavelengths.
- Both (though the relationship is inversely proportional; as frequency increases, wavelength decreases)
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The waves are formed by the movement of packets of high energy photons.
- Electromagnetic Waves
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The waves cause particles to vibrate but they do not move far from equilibrium.
- Mechanical Waves