| 21. | The second main type, electromagnetic waves, do not require a medium.
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| 22. | In the spectral range of the PBG, electromagnetic waves cannot propagate.
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| 23. | Many electromagnetic wave effects from spatial dispersion find an analogue in acoustic waves.
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| 24. | But electromagnetic waves don't travel well through certain kinds of rock.
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| 25. | Carrara founded the Electromagnetic Wave Research Institute in Florence in 1946.
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| 26. | In both communications, communication is in the form of electromagnetic waves.
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| 27. | During this time Hertz conducted his landmark research into electromagnetic waves.
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| 28. | Since photons contribute to the stress energy tensor, they exert a electromagnetic waves.
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| 29. | The first microwave metamaterial cloak guided electromagnetic waves in two dimensions.
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| 30. | See electromagnetic wave equation for a discussion of this important discovery.
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