Alpha Decay

A heavy nucleus Q of half life 20 minutes undergoes alpha decay with probability of 60% and beta decay with probability of 40%. Initially number of Q nuclei is 1000. The number of alpha decay of Q in the first one hour is.

A nucleus X initially at rest, undergoes alpha decay according to the equation _Z^232Xrarr_90^AY+alpha What fraction of the total energy released in the decay will be the kinetic energy of the alpha particle?

Staements I: In alpha decay of different radioactive nuclides, the energy of alpha particles has been compared. It is found that as the energy of alpha particle increases the half-life of the decay goes on decreasing. Staements II: More is the energy in any decay process, more is the probability of decaying the nuclide which leads to faster rate of decay.

U^238 decays into Th^234 by the emission of an a-particle. There follows a chain of further radioactive decays, either by alpha -decay or by beta- decay. Eventually a stable nuclide is reached and after that, no further radioactive decay is possible. which of the following stable nuclides is the end product of the U^238 radioactive decay chain ?

When a nucleus with atomic number Z and mass number A undergoes a radioactive decay process, (i) Both Z and A will decrease, if the process is alpha decay (ii) Z will decrease but A will not change, if the process is beta^(+)- decay (iii) Z will increase but A will not change, if the process is beta- decay (iv) Z and a will remain uncharged, if the prices is gamma decay

When nucleus of an electrically neutral atom undergoes a radioactive decay process, it will remain neutral after the decay if the process is (a) An alpha - decay (b) A bete^(o+) -decay (c ) A gamma -decay (d) A K - caputure process

In the thorium decay series that begins with .^(232)Th,.^(228)Th alpha-decays into .^(224)Ra with a half life of 1.9yr. .^(224)Ra alpha-decays into .^(230)Rn with a half life of 3.7d, which in turn decays into .^(216)Po with a half life of 55s. If the nuclides are in radioactive equilibrium in a mineral sample that contains 1.0g of .^(220)Rn , what are the masses of .^(224)Ra abd ,^(228)Th in the sample?