Sometimes, the Microsoft Outlook integration is successful but you might not see the users' presence status/presence bubble in Microsoft Outlook. In order to troubleshoot this problem, verify these points:
2. Half-life is the time taken for the count rate to fall to half of its original reading. There are a number of ways to define half-life. Remember one of the above definitions, it may be useful in the exams. An Explanation of Half-life. A radioactive material will have some nuclei that are stable and some that are unstable.
But it is possible to measure how long it takes for half the nuclei of a piece of radioactive material to decay. This is called the half-life of the radioactive isotope. There are two definitions of half-life, but they mean essentially the same thing. Half-life is the time taken for: 1  The number of nuclei of the radioactive isotope in a sample to halve. 2  The count rate from a sample containing the radioactive isotope to fall to half its starting level.