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I figure that Mie scattering is best for finding the scattering when the wavelengths are between 1/10th to 10x the particle diameter. However, is there an upper limit to this? If I send 2.8cm microwaves into a 10cm sphere, will it scatter according to Mie Scattering?

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To answer your specific question: Mie theory is used to calculate radar cross sections and radar wavelengths are around a few cm. So Mie theory will certainly work in your case.

Whether there is an upper limit I don't know, but I can't see why there should be.

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To add to John Rennie's answer: the Mie solution is valid for any wavelength / particle diameter ratio. However, beyond the range indicated in the question, much simpler theories may give a decent accuracy (it also strongly depends on the electric properties of the sphere though), so using the Mie solution may be an overkill.

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