1 gm of radiactive substance takes 30sec to lose 1 centigram. Find its half life period.

(a) The half life period of radium is 1590 yrs. After how many years will one gram of the pure element, (i)be reduced to one centigram, (ii) lose one centigram. (b) The half life of radon is 3.8 days. After how many days will only one twentieth of radon sample be left over? (c) 1 gm of radioactive substance takes 50 sec. to lose 1 centigram. Find its half life period?

One gram of a radiactive substance takes 50 to lose 1 centigram. Find its half-life period.

The decay constant of radioactive substance is 4.33 xx 10^(-4) per year. Calculate its half life period .

If 3//4 quantity of a radioactive substance disintegrates in 2 hours, its half - life period will be

7/8 of the original mass of a radioactive substance decays in 30 min. What is the half life of the radioactive substance ?

4 grams of radioactive substance A left 1//2 gm after some ture. 1 gran of another radioactive substance B left 1//4 gm in the same period, If half life of B is 2 hours, the half life of A is ( in hours)

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 in 3160 years, a radioactive substance becomes one-fourth of the original amount, find it’s the half-life period.