Question

Which of the following quantities are unknown?

Select all that apply.

Select all that apply.

the initial speed of the alpha particle
the charge of the alpha particle
the value of the electric potential at the initial position of the alpha particle
the value of the electric potential at the final position of the alpha particle
the final speed of the alpha particle
the difference in potential between the initial and final positions of the alpha particle
the mass of the alpha particle

Answer 1

The charge on the alpha particle is +2. That's true of all alpha particles. The other 6 quantities are all unknown to us, because you neglected to give us any of the information that goes with this question.