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.
Half-life is a measure of the time taken for the unstable nuclei to change into stable nuclei. Some do it very quickly and half of the unstable nuclei decay in less than one second. For example, lithium-8 has a half-life of only 0Â·85 seconds. Some do it very slowly and half of the unstable nuclei take billions of years to decay. For example, uranium-238 has a half-life of 4Â·51 billion years. Remember that half-life is an amount of time.