Question

The diagram shows the paths of four $\alpha$- particles , having the same energy, being scattered by the nucleus of an atom simultaneously. Which of these is not possible physically ?

• A. $3$ & $4$
• B. $2$ & $3$
• C. $1$ & $4$
• D. $4\text{only}$

Answer 1

The correct option is D $4\text{only}$

$\alpha -$particles are scattered by the nucleus due to the force of repulsion between them and the nucleus.

Trajectories of particles $1,2,\text{and}3$ clearly indicate influence of force of repulsion. But the trajectory of particle $4$ indicate influence of force of attraction, which is not possible.

Hence, $\left(D\right)$ is the correct answer.