JEE Main2013PhysicsNuclear PhysicsActual
The half-life of a radioactive element A is the same as the mean-life of another radioactive element B. Initially both substances have the same number of atoms, then :
Options
- AA and B decay at the same rate always.
- BA and B decay at the same rate initially.
- CA will decay at a faster rate than B.
- DB will decay at a faster rate than A .
Correct answer
D. B will decay at a faster rate than A .
Step-by-step solution
( T _ 1 / 2 )_ A = ( t _ mean )_ B 0.693 _ A = 1 _ B _ A =0.693 _ B or _ A _ A , therefore B will decay at a faster rate than A