What is half-life? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and 12 Students CBSE Exams.
What is half-life?
When we talk of the half-life of a radioactive substance we mean the rate at which the nuclei of its atoms are decaying. It is the time taken for half of the atoms in a sample of the substance to decay. It differs for different substances. Thus thorium has a half-life of 24 days while radium-221 has a half-life of30 seconds.
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