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What expression can be used to determine the wavelengths of the resonances of metamolecules?

What expression can be used to determine the wavelengths of the resonances of metamolecules? Correct Answer λ0 ≈ √ꜫ(2le/m)

The wavelengths of the resonances of metamaterials can be estimated by the equatio– λ0 ≈ √ꜫ (2le/m) where le is the total electrical length of the metallic pattern that forms the metamaterials, ꜫ is the relative permittivity of the dielectric medium that the pattern is embedded in, and m is a positive integer. Resonances with m > 4 are quite impossible to engineer in subwavelength metamolecules because le > λ0.

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