(A): Helium is found in radioactive minerals (R): During alpha -day, helium is formed and is occluded in radioactive minerals
The half-life of ._(92)^(238)U undergoing alpha - decay is 4.5xx10^(9) years. What is the activity of 1g sample of ._(92)^(238)U ?
We are given the following atomic masses : ._(92)^(238)U = 238.05079 u " " ._(2)^(4)He=4.00260 u ._(90)^(234)Th=234.04363u " " ._(1)^(1)H=1.00783 u ._(91)^(237)Pa=237.05121 u Here the symbol Pa is for the element protactinium (Z = 91) . Calculate the energy released during the alpha decay of ._(92)^(238)U .
The emission of penetraing alpha , beta particle (""_(2) ^(4) He and ""_(-1)^(0)e respectively ) along with gamma - radiation (hv) was noticed from unstable nuclei . All elements having Z gt 82 show this phenomenon . The emission was explained in terms of low binding energy (giving alpha - decay) high n/p ratio (neutron decay) , gamma from a radioactive nuclide is secondary emission. An element of group III with At. no. 90 and mass number of 238 undergoes decay of one alpha - particle . The newly formed element belongs to :
The emission of penetraing alpha , beta particle (""_(2) ^(4) He and ""_(-1)^(0)e respectively ) along with gamma - radiation (hv) was noticed from unstable nuclei . All elements having Z gt 82 show this phenomenon . The emission was explained in terms of low binding energy (giving alpha - decay) high n/p ratio (neutron decay) , gamma from a radioactive nuclide is secondary emission The emission of penetrating rays from a radioactive species can be shielded by
The emission of penetraing alpha , beta particle (""_(2) ^(4) He and ""_(-1)^(0)e respectively ) along with gamma - radiation (hv) was noticed from unstable nuclei . All elements having Z gt 82 show this phenomenon . The emission was explained in terms of low binding energy (giving alpha - decay) high n/p ratio (neutron decay) , gamma from a radioactive nuclide is secondary emission The binding energy of the hydrogen nucleus is :
Explain alpha - decay ?
The half life of ""_(92)^(238)U against alpha - decay is 13.86xx10^(16) s . The activity of 1 g sample of is
A nuclide A undergoes alpha - decay and another nuclide B undergoes beta -decay (a) All the alpha -particle emitted by A will have almost the same speed ( b) The alpha - particle emitted by A may have widely different speeds (c) All the beta -particle emitted by B will have almost the same speed (d) The beta -particle emitted by B may have widely different speeds
