One gram of `.^(226)Ra` has an activity of nearly 1 Ci. The half life of `.^(226)Ra` is,

One gram of Ra^(226) has an activity of nearly 1 Ci the half life of Ra^(226) is a. 1500 years b. 300 years c. 1582 years d. 200 years

One gram of Ra^(226) has an activity of nearly 1 Ci the half life of Ra^(226) is a. 1500 years b. 300 years c. 1582 years d. 200 years

One gram of _(88) Ra^(226) has activity of one curie .Find its half-life period.

""^(226)Ra disintegrates at such a rate that after 3160 years, only one fourth of its original amount remains . The half life of ""^(226)Ra will be

U^(238) is found to be in secular equilibrium with Ra^(226) in its ore. If chemical analysis shown 1 atoms of Ra^(226) per 2.8xx10^(6) atoms of U^(238) , find the half-like of U^(228) . Given the half life Ra^(226) is 1620 years.