In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

An example of its inverse is the Sunyaev-Zeldovich effect, and the cross-section of this process, derived from the assumptions of conservation of energy and momentum, is given by the Klein-Nishina formula. It results in a shift proportional to one minus the cosine of the incident angle and also proportional to Planck's constant over the electron mass times the speed of light, a parameter known as this effect's namesake wavelength. FTP, identify this effect which describes the inelastic scattering of a photon from an electron, which demonstrated the particle nature of light and won its discoverer the 1927 Nobel Prize in Physics.
Science