The work function for metallic sodium is 27ev a at what

The work function for metallic sodium is 2.7eV.

(a) At what distance beyond the surface of metallic sodium is the electronâ€^TMs probability density 10% of what it is at the surface?

(b) How does this distance compare to the size of the atom?

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The work function for metallic sodium is 27ev a at what : the work function for metallic sodium is 2.7ev.a at what distance beyond the surface of metallic sodium is the

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