Explain the statement: Half-life of polonium is 3.8 days.

After a certain lapse of time , fraction of radioactive polonium undecayed is found to be 12.5 % of the initial quantity. What is the duration of this time lapse, if half-life of polonium is 139 days?

Determine the amount of ""_(84)Po^(210) (polonium ) necessary to provide a source of alpha -particles of 5 millicurice strength , if life of polonium is 138 days (given ,1 curie =3.7xx10^(10) disintegrations /s )

Half-life of (14)C is :

Write the rate law for a first order reaction and justify the statement that half-life of such a reaction is independent of the initial concentration of the reactants.

Half life period of lead is

The half-life of radioactive Polonium (Po) is 138.6 days. For ten lakh Polonium atoms, the number of disintegrations in 24 hours is.

The half life of polonium is 140 days. In what time will 15 g of polonium be disintegrated out of its initial mass of 16 g ?

The half-life of pononium is 140 days. After how many days. 16 gm polonium will be reduced to 1 gm (or 15 gm will decay) ?

In a sample initially there are equal number of atoms of two radioactive isotopes A and B. 3 days later the number of atoms of A is twice that of B. Half life of B is 1.5 days. What is half life of isotope A? (in days)

A sample contains 16 gm of radioactive material, the half-life of which is two days. After 32 days, the amount of radioactive material left in the sample is