A free neutron is unstable against beta - decay with a half life of about 600 seconds - If there are 600 free neutrons initially, calculate the time by which 450 of them have decayed. Also determine the decay rate of the sample.
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A free neutron is unstable (with a half-life of about $10.8$ minutes), decaying into a proton, an electron, and an antineutrino. If 1000 neutrons are created at once, how many will remain after a time of $1.00$ min? [Hint: Study the previous problem.]
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is:
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