A certain radio isotope `._(Z)X^(A)` (half life `= 10 ` days) decays to give `._(Z-2)Y^(A-4)` . If `1.0 g` atom of `X` is kept in a sealed vessel, find the volume of helium accumulated at `STP` in `20` days ?

A radioisotope ._(Z)A^(m) (t_(1//2) = 10 days) decays to give ._(z - 6)B^(m - 12) stable atom along with alpha -particles. If m g of A are taken and kept in a sealed tube, how much He will accumulate in 20 days at STP .

A certain radioactive isotope decay has alpha -emission, ._(Z_(1))^(A_(1))X to ._(Z_(1)-2)^(A_(1)-4)Y half life of X is 10 days. If 1 mol of X is taken initially in a sealed container, then what volume of helium will be collected at STP after 20 days?

How many atoms of 0.1 g -atom of a radioacitve isotope ._(Z)X^(A) (half = 5 days) will decay during the 11th day?

""_(84)Po""^(210) decays with a particle to ""_(82)Pb""^(206) with a half life of 138.4 days. If 1.0 g of ""_(84)Po""^(210) is placed in a sealed tube, how much helium will accumulate in 69.2 days. Express the answer in cm""^(3) at STP