ملتقى الفيزيائيين العرب - عرض مشاركة واحدة - مامعنى كلمة اشعاع اريد الاجابة
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قديم 02-12-2010, 17:38
الصورة الرمزية maan
maan
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تاريخ التسجيل: Nov 2005
المشاركات: 742
رد: مامعنى كلمة اشعاع اريد الاجابة

In physics, radiation describes a process in which energetic particles or waves travel through a medium or space. There are two distinct types of radiation; ionizing and non-ionizing. The word radiation is commonly used in reference to ionizing radiation only (i.e., having sufficient energy to ionize an atom), but it may also refer to non-ionizing radiation (e.g., radio waves or visible light). The energy radiates (i.e., travels outward in straight lines in all directions) from its source. This geometry naturally leads to a system of measurements and physical units that are equally applicable to all types of radiation. Both ionizing and non-ionizing radiation can be harmful to organisms and can result in changes to the natural environment
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