I have no idea where to start for this question. I feel as though their speeds w

Question

I have no idea where to start for this question. I feel as though their speeds would be slightly different due to Argon having more of a shielding affect on its electrons. This will hinder both the attractive force and the reppelent force of the opposite charges. I'am usure though. Please use diagrams. Thank you.

An atom of helium and one of argon are singly ionized—one electron is removed from each. The two ions are then accelerated from rest by the electric field between two plates with a potential difference of 150 V. After accelerating from one plate to the other, what can you say about the relative kinetic energies of the two particles? The relative speeds?

Explanation / Answer

both have same kinetic energies

after accelerating from one plate to another both will have same kinetic energy as the potential difference and charge on both the atom is same so kinetic energy would also be same.

and relative speed would be different as the masses of both the atom is different.

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