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Scattering is a general term for several physical processes in which radiation of some sort changes direction due to an interaction with a particle. Scattering can be classified by the type of radiation (ie, electromagnetic, x-ray, neutron), or by the relative sizes of the wave and the particle (ie, Rayleigh, Mie, geometric).

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Compute the value of $\lim_{x \to-\infty}Ae^{ikx}+Be^{-ikx}$

I couldn't understand your question properly but I think may be you're asking in one dimensional potential well problem why we don't consider the case where x tends to infinity. If that's the question …
Saswata Roy's user avatar