Question 637
{"accessible":false,"alternatives":[{"id":3187,"text":"a small wave packet or bundle of electromagnetic radiation"},{"id":3188,"text":"an accelerated electron (in the diagnostic range)"},{"id":3189,"text":"any electron emitted from the photo-sensitive surface of an image intensifier tube"},{"id":3190,"text":"the collimated x-ray beam"}],"archived":false,"correctAlternativeId":3187,"explanation":"\u003cp\u003eThe spectrum is the broadest-ranging physical phenomenon known to science. It can be seen in the figure to extend from waves with a wavelength of much greater than 1 metre to wavelengths less than a millionth, millionth, millionth of a metre. At these tiny wavelengths, the radiation can be considered to be small wave packets, which are also called photons.\u003c/p\u003e\u003cp\u003eAdapted from\u0026nbsp;\u003ca href=\"https://en.wikibooks.org/wiki/Basic_Physics_of_Digital_Radiography\"\u003eBasic Physics of Digital Radiography\u003c/a\u003e\u0026nbsp;by\u0026nbsp;Kieran Maher,\u0026nbsp;with author's permission (License:\u0026nbsp;\u003ca href=\"https://creativecommons.org/licenses/by-sa/3.0/\"\u003eCreative Commons\u0026nbsp;BY-SA 3.0\u003c/a\u003e).\u003c/p\u003e","id":637,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/649","nextQuestionPath":"/articles/x-ray-production-2/questions/615","relatedArticles":[{"id":5306,"title":"Electron","link":"/articles/electron?lang=gb"}],"alsoUsedIn":[],"stem":"\u003cp\u003eThe term photon was coined to apply to...\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/637"}],"attemptsPercentages":[{"alternativeId":"3190","percentage":6},{"alternativeId":"3188","percentage":15},{"alternativeId":"3187","percentage":65},{"alternativeId":"3189","percentage":14}],"promptToLogin":false,"questionManager":false,"articleId":"x-ray-production"}