Question

${}_{92}{U}^{235}$ is an alpha active nucleus. Then in a large quantity of the element

• 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 the time
• C. quite an appreciable quantity of $U^{235}$ will remain, even after average life
• D. the energy of emitted a-particle is greater than the disintegration energy of the $U^{235}$ nucleus

Answer 1

The correct option is A the probability of a nucleus disintegrating during one second is lower in the first half-life and greater in the fifth half-life

${}_{92}{U}^{235}$

$-\frac{△N}{△t}=kN=\lambda N_o{e}^{-\lambda t}$

So, disintegration changes with time exponentially

So, $\left(A\right)$ is correct option.