A radioactive isotope X has a half life of 3 seconds. At t=0, a given sample of this isotope contains 8000 atom. Calculate (i) its decay constant (ii) average life (iii) the time `t_1`, when 1000 atoms of the isotope X remain in the sample (iv) number of decay/sec in the sample at `t=t_1sec.`

A radioactive isotope X has a half life of 3 seconds. At t=0, a given sample of this isotope contains 8000atom. Calculate (i) its decay constant (ii) average lige (iii) the time t_1 , when 1000 atoms of the isotope X remain in the sample (iv) number of deacy/sec in the sample at t=t_1sec.

A radioactive isotope has a half life of T years. It radius to 3.125% of its original value in

The half life of a radioactive substance is 20s. Calculate (i) the decay constant, and (ii) time take by the sample to decay by 7//8th of its inital value

A radioactive substance has a half-life of 64.8 h. A sample containing this isotope has an initial activity (t=0) of 40muCi . Calculate the number of nuclei that decay in the time interval between t_1=10.0h and t_2=12.0h .

A radioactive isotope has a half-life of T years. After how much time is its activity reduced to 6.25% of its original activity ? Given T _(1//2)=T

A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain.

A certain nuclide has a half life period of 30 min. If a sample containing 600 atoms is allowed to decay for 90 min, how many atoms will remains?

A radioactive isotope has a life of T years. How long will it take the activity to reduce to (a) 1% of its original activity?

A freshly prepared sample of a certain radioactive isotope has an activity of 10mCi. Afte 4.0h its activity is 8.00 mCi. (a) Find the decay constant and half-life How many atoms of the isotope were contained in the freshly preapared sample? (c) What is the sample's activity 30.0 h after it is prepared?