JEE Main2007PhysicsNuclear PhysicsActual
The half-life period of a radio-active element X is same as the mean life time of another radioactive element Y . Initially they have the same number of atoms. Then
Options
- AX will decay faster than Y
- BY will decay faster than X
- CX and Y have same decay rate initially
- DX and Y decay at same rate always.
Correct answer
B. Y will decay faster than X
Step-by-step solution
t _ 1 / 2 = 2 _ x _ mean = 1 _ y ; dN dt =- N 2 _ x = 1 _ y _ x = _ y (0.6932) _ y > _ x