What is meant by the statement that the half-life of radium is 1622 years ?

What do you mean by the statement— “Half life of Radium is 1622 year’s."

The amount of radium in a radioactive sample is 16 g. What amount of radium will remain in the same after 4800 y if the half-life of radium is 1600 y ?

Find the half-life of uranium, given that 3.32 xx 10^(7) g radium is found per gram of uranium in old minerals. The atomic weights of uranium and radium are 238 and 226 and half-life of radium is 1600 years (Avogadro number is 6.023 xx 10^(23)//g -"atom" ).

Find the half-life of uranium, given that 3.32 xx 10^(7) g radium is found per gram of uranium in old minerals. The atomic weights of uranium and radium are 238 and 226 and half-life of radium is 1600 years (Avogadro number is 6.023 xx 10^(23)//g -"atom" ).

In how many years 1 g of pure radium will be reduced to 1 milligram? The half-life of radium is 1,500 years.

For every 10^6 atoms of radium in a sample today, find the number of atoms that will be left after 3200 years. Assume half-life of radium to be 1600 years.

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

Experiments show that radium decomposes at a rate proportioanl to the amount of radium present at the moment. If its half life is 1570 years, what percentage will disappear in one years?

One gram of radium is reduced by 2 milligram in 5 years by alpha - decay. Calculate the half-life of radium.