Question 489
{"accessible":false,"alternatives":[{"id":2455,"text":"coherent scattering\r\n"},{"id":2456,"text":"Compton scatter \r\n"},{"id":2457,"text":"pair production \r\n"},{"id":2458,"text":"photoelectric effect\r\n"},{"id":2459,"text":"photo nuclear disintegration \r\n"}],"archived":false,"correctAlternativeId":2456,"explanation":"\u003cp\u003eCompton scattering will occur predominantly in the outer\u0026nbsp;electrons of an atom due to the potential for them to become unbounded and carry some momentum.\u0026nbsp;\u003c/p\u003e\u003cp\u003eThis results in a 'billiard ball' phenomenon where the energy of the electron plus the energy of the now scattered photon will equal the incident photon energy.\u003c/p\u003e\u003cp\u003eTo simplify, you could conclude that the inner or 'core' electrons\u0026nbsp;are not involved in Compton scatter as they are bound very tight.\u003c/p\u003e\u003cp\u003e\u003cstrong\u003eCoherent scattering\u0026nbsp;\u003c/strong\u003eoccurs when a lower energy photon (\u0026lt;10 KeV) passes near an electron, exciting the electron returning it to a ground state and emitting\u0026nbsp;another photon with the same energy (elastic).\u003c/p\u003e","id":489,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2748","nextQuestionPath":null,"relatedArticles":[{"id":29684,"title":"Photoelectric effect","link":"/articles/photoelectric-effect?lang=us"},{"id":31661,"title":"Pair production","link":"/articles/pair-production?lang=us"},{"id":30308,"title":"Compton effect","link":"/articles/compton-effect?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eRegarding light matter interaction, an incident photon collides with an outer electron causing inelastic scatter of the photon\u0026nbsp;during...\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/489"}],"attemptsPercentages":[{"alternativeId":"2459","percentage":2},{"alternativeId":"2457","percentage":3},{"alternativeId":"2458","percentage":10},{"alternativeId":"2455","percentage":17},{"alternativeId":"2456","percentage":68}],"promptToLogin":false,"questionManager":false,"articleId":"coherent-scattering"}