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So I just learned: $$K_{max} = hf - \phi$$($\phi$ for ionization energy)

I wonder what will happen if $K_max$ is zero. Will it be attracted back to the ionized atom it has come from since it doesn't have any energy to move away from it?

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marked as duplicate by John Rennie, Kyle Kanos, ACuriousMind, Martin, Qmechanic Aug 8 '15 at 23:41

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    $\begingroup$ possible duplicate of Ejected Electrons with 0 KE? $\endgroup$ – John Rennie Aug 7 '15 at 14:02
  • $\begingroup$ @JohnRennie, so I was correct in saying that if the electron has too little energy, or no energy at all, it will get pulled back into the atom? But how much is too little? $\endgroup$ – most venerable sir Aug 7 '15 at 14:21