One gram of `._(79)Au^(198) (t_(1//2) = 65hr)` decays by `beta-` emission to produce stable `Hg`.
(a) Write nuclear reaction for process.
(b) How much `Hg` will be present after `260 hr`?

1 g of ._(79)Au^(198) (t_(1//2) = 65 hr) decays by beta -emission to produce stable Hg . a. Write nuclear reaction for process. b. How much Hg will be present after 260 hr.

1 g of ._(79)Au^(198)(t_(1//2)=65h) gives stable mercury by beta- emission. What amount of mercury will left 260 h?

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 .

Out of300g substance [decomposes as per 1st order]. How much (nearly)will remain after 18 hr? (t_(1//2) = 3hr)

A radioactive sample consists of two isotopes one of then decays by alpha- emission with a half life of tau_(1)=405s and the other one decays by beta emission with half life of tau_(1) =1620s . At time t=0, probabilities of getting alpha and beta particles from the sample are equal. (a) If a particle coming out of the sample is detected at t=1620s, what is the probability that it is alpha particle? (b) Find the time when total number of surviving nuclei is half the initial quantity. Given If x^(4)+4x-2.5=0 then x=0.59 "log"_(10)2=0.301, "log"_(10)5.9=0.774