Task: Text Categorization
Input (English): One perturbative solution to this kind of problem takes the form of an infinite series of Feynman  diagrams that diverges. When finding an approximation for this kind of problem in the case of long  wavelengths, the exponential term simply vanishes and all that must be integrated is the interaction  potential; that is a special case of the Born Approximation. In quantum mechanics, this kind of  problem usually is solved by finding the associated (*) amplitude of a wave, given that a plane wave encounters a potential and is transformed into a spherical wave. Classically, this type of problem is  typically solved by finding the namesake angle given the impact parameter. For 10 points, name this  kind of process in which a particle changes direction after a collision.
Output (English): Science