The half-life of `"_38^90Sr` is 28 years. What is the disintegration rate of 15 mg of this isotope.

The half life of _6C^(14) is 5,700 years .what does it mean?

Half life of radium is 1600 years. Its average life:

The half-life of ._(6)^(14)C is 5730 year. What fraction of its original C^(14) would left after 22920 year of storage?

The half-life of a radioactive substance is 1,672 years. If the initial mass of the substance is 1 g, after how many years will only 1 mg of it to be left behind?

A radioactive isotope X with half-life of 693xx10^(9) years decay to Y which is stable. A sample of rock from of the moon was found to contain both the elements X Y in the mole ratio 1:7 . What is the age of the rock ? a) 2.079xx10^(12) years b) 1.94xx10^(10) years c) 1.33xx10^(9) years d) 10^(10) years

The present activity of the hair of Egyption mummy is 1.75 dpm t_(1//2) of ._(6)^(14)C is 5770 year and disintegration rate of fresh smaple of C^(14) is 14 dpm . Find out age of mummy. a) 23080 year b) 138480 year c) 11998.3 year d) 17315 year