The half-life of cobalt-60 is 5.26 years. Calculate the percentage activity remaining after 4 years.

The half-life of cobalt - 60 is 5.26 years. Calculate the % activity remaining after 4 years.

The half-life of cobalt - 60 is 5.26 years. Calculate the % activity remaining after 4 years.

The half-life of cobalt - 60 is 5.26 years. Calculate the % activity remaining after 4 years.

The half-life of cobalt - 60 is 5.26 years. Calculate the % activity remaining after 4 years.

Half-life of iodine (atomic mass 125) is 60 days. Calculate the present of radioactivity remain after 120 days.

Half life of a radioactive material is 3600 years. Calculate the average life

The half life of Ra is 1600 years. The fraction of a sample of Ra that would remain after 6400 years is

The half-life periof of a radioactive substance is x years. The fraction remaining after 2x years is………….. .

The half life of Ra is 1600 years. The fraction of a sample of Ra that would remain after 6400 years is

The half-life periof of a radioactive substance is x years. The fraction remaining after 2x years is………….. .