`1.0 g` of a radioactive isotope left `125 mg` after 24 hr. The half-life period of the isotope is
a. 8 hr b. 24 hr c. 6 hr d. 4 hr

10 g of a radioactive isotope is reduced to 1.25 g in 12 years. Therefore half-life period of the isotope is

If 2.0 g of a radioactive isotope has a half life of 20 hr, the half life of 0.5 g of the same substance is

If 9.0 g of a radioactive isotope has a half life period of 10 hrs. The half life period of 3.0 g of the same substance is:

If 9.0 g of a radioactive isotope has a half life period of 10 hrs. The half life period of 3.0 g of the same substance is:

After 24 hour, only 0.125" g" out of the initial quantity of 1 g of a radioactive isotope remains behind. The half-life period of the radioactive isotope in hours is