A sample of `beta` active nuclei has a half life o f `100` min. Initially there are `10^(13)beta^(-)` active nuclei. Assume that all `beta^(-)` particles emitted leave the sample.What is the charge acquired (in `mu C`) by the sample in 200 min?

A radioactive substance emit 100 beta particfles in the first 2 s and 50 beta particles in the next 2s. The mean life of the sample is

A radioactive substance emits n beat particles in the first 2 s and 0.5 n beta particles in the next 2 s. The mean life of the sample is

7/8th of the active nuclei present in a radioactive sample has decayed in 8 s. The half-life of the sample is

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

There are n number of radioactive nuclei in a sample that undergoes beta decay. If from the sample, n' number of beta -particels are emitted every 2s , then half-life of nuclei is .

There are n number of radioactive nuclei in a sample that undergoes beta decay. If from the sample, n' number of beta -particels are emitted every 2s , then half-life of nuclei is .

A sample of a radioactive substance has 10^(6) radioactive nuclei. Its half life time is 20 s How many nuclei will remain after 10 s ?

In a sample of radioactive material , what fraction of the initial number of active nuclei will remain undisintegrated after half of the half life of the sample ?

In a sample of radioactive material, what fraction of initial number of active nuclei will remain undistintegrated after half of a half0life of the sample?

(a) Calculate the activity of one mg sample ._(28^(Sr^(90))) whose half life period is 28 years. (b) An experiment is performed to determine the half-life of a radioactive substance which emits one beta particle for each decay process. Observation shown that an average of 8.4 beta- particles are emitted each second by 2.5 mg of the substance. the atomic weight of the substance is 230 . calculate the half0life of the substance. (c) Determine the quantity of ._(84^(Po^(210))) necessary to provide a source of alpha particle of 5mCi strength ( T_(1//2) for Po = 138 day).