Two elements `P` and `Q` have half-line of `10` and `15` minutes repectively. Freshly preapared sample of mixuture containing equal number of atoms is allowed to decay for `30` minutes. The ratio of number of atoms of `P` and `Q` in left in mixture is:

Two elements P and Q have half lives of 10 and 15 minutes respectively. Freshly prepared samples of each isotope initial contain the same number of atoms as each other. After 30 minutes, the ratio of number of P atoms to number of Q atoms will be :

Two radioactive elements X and Y have half-life periods of 50 minutes and 100 minutes, respectively. Initially, both of them contain equal number of atoms. Find the ratio of atoms left N_XIN_Y after 200 minutes.

Two radioactive elements X and Y have half-life periods of 50 minutes and 100 minutes, respectively. Initially, both of them contain equal number of atoms. Find the ratio of atoms left N_X/N_Y after 200 minutes.

Two radioactive elements X and Y have half life periods of 50 minutes and 100 minutes respectively. Initially both of them contain equal number of atoms. Find the ratio of atoms left N_(x) //N_(y) after 200 minutes.

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 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 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain

The radioactive elements A and B have half-lives of 15 and 5 minute respectively. Thew experiment begins with 4 times the number the number of B atoms as A atoms. At which of the followig times does the number fo A atoms left equals the number of B atoms left: