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Can someone give me an intuitive idea of the acoustic radiation force.

I have read from a paper that the acoustic radiation force generated by a standing acoustic wave is larger when the size of particle is smaller than the acoustic wavelength as compared to the case when size > wavelength. I did search in the internet, where there are complex equations to prove it. But could someone give me a physical understanding of this behavior?

Thanks in advance!

Regards,

Radel.......