Which sample contains greater number of nuclei ? a `5.00 -mu Ci` sample of `.^240 Pu` (half-life `6560 y`) or `a 4.45-mu Ci` sample of `.^243 Am` (half-life `7370 y`).
A sample contains large number of nuclei. The probability that a nucleus in sample will decay after four half lives is
The number of C^(14) atoms in a sample is 100 . The half- life period of C^(14) is 5730 year . The number of C^(14) atoms in the sample after 5730 year.
A sample contains a large number of nuclei. The probability that a nucleus in the sample will decay after four half - lives is (a)/(b) where a and b are least positive integers. Value of a+b will be
Two radioactive substance X and Y initially contain equal number of nuclei. X has a half life of 1 hour and X has a half-life of 2 hours. After the ratio of activity of X to that of y is
A radioactive sample X has thrice the number of nuclei and activity one-third as compared to other radioactive sample Y. The ratio of half-lives of X and Y is
A radioactive sample S_(1) having an acitivity of 5 mu Ci has twice the number of nuclei as another sample S_(2) which has a activity of 10 mu Ci . The half lives of S_(1) and S_(2) can be
A sample contains 1 kg O^(19) nuclei . The sample decays according to following equation O^(19) to F^(19) + e + barv The mass of sample after one half-life period is
