[" Calculate the specific activities of "Na^(24)" and U235nuclides whose half-lifes are "15" hours and "],[7.1.10^(8)" years respectively."]

Calculate the specific activities of Na^(24) & U^(235) nuclides whose half lives are 15 hours and 7.1xx10^(8) years respectively.

Calculate the specific activities of Na^(24) & U^(235) nuclides whose half lives are 15 hours and 7.1xx10^(8) years respectively.

Calculate the average life of a radioactive substance whose half-life period is 100 years.

Calculate the average life of a radioactive substance whose half-life period is 100 years.

Calculate the average life of a radioactive substance whose half life period is 1650 years.

The isotope of U^(238) and U^(235) occur in nature in the ratio 140:1 . Assuming that at the time of earth's formation, they were present in equal ratio, make an estimate of the age of earth. The half lives of U^(238) and U^(235) are 4.5xx10^9 years and 7.13xx10^8 years respectively. Given log_(10)140=2.1461 and log_(10)^2=0.3010.

The isotope of U^(238) and U^(235) occur in nature in the ratio 140:1 . Assuming that at the time of earth's formation, they were present in equal ratio, make an estimate of the age of earth. The half lives of U^(238) and U^(235) are 4.5xx10^9 years and 7.13xx10^8 years respectively. Given log_(10)140=2.1461 and log_(10)2=0.3010.

The isotope of U^(238) and U^(235) occur in nature in the ratio 140:1 . Assuming that at the time of earth's formation, they were present in equal ratio, make an estimate of the age of earth. The half lives of U^(238) and U^(235) are 4.5xx10^9 years and 7.13xx10^8 years respectively. Given log_(10)140=2.1461 and log_(10)2=0.3010.