`._(92)U^(235)` is `alpha` (alpha) active. Then in a large quantity of the element:

Options

A. the probability of a nucleus disintegrating during one second is lower in the first half life and greater in the fifth half life
B. the probability of a nucleus disintegrating during one second remains constant for all time
C. more then half of `U^(235)` will remain even after the average life
D. the energy of the emitted 'alpha' particle is less then disintegration energy of the `U^(235)` nucleus.

Answer

B, D

Explanation

* the probalility of decay in 1 sec is the decay constant `lambda` which remains constant
* after average life 37% of nuclei remain undecayed.
*Part of energy of disintegration is taken by the recoiling doughter nucleus.