What is radioactivity? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and 12 Students CBSE Exams.
What is radioactivity?
Some of the elements we know are not stable. Their nuclei are always breaking down or decaying as they shed particles in order to become stable. This is called radioactivity. The particles that they emit are called radiation. There are three of them—alpha, beta and gamma rays.
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