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Curie-Weiss law (P. Curie, P.-E. Weiss)
A more general shape of Curie's law, that states that the susceptibility, khi, of an paramagnetic substance is associated to its thermodynamic temperature T through the equation
khi = C/T - W
What is the wavelength of electromagnetic waves of frequency 5 x 1019Hz in free space? Give its two applications.
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