we all know what are electromagnetic radiations but what are radiations...??? define properly

Question

anonymous · Answer

i just wanted general defination

anonymous · Answer

Per wikipedia-
In physics, radiation is a process in which energetic particles or energy 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).
 *  mind you they travel at different wavelength and frequencies.  Hence radiation spectrum.

anonymous · Answer

oh.... great.... really thanks... got answer for my very old question... thank you very much...