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we know the relation between wavelength, frequency and energy :

The greater the energy, the larger the frequency and the shorter (smaller) the wavelength -> E=h[itex]\upsilon[/itex]

On the other side, SAR is common property that measures absorbed energy.

Now if we calculating SAR for human brain tissue , we would have such graph :

But i don't understand why it behaves like that , why SAR doesn't increase with frequency ?