(adsbygoogle = window.adsbygoogle || []).push({}); Negative work function??

Hello,

I'm studying the photoelectric effect from the book of Zettili. It has an example that calculated the work function of lead knowing the maximum kinetic energy of the phtoelectrons (8.57 eV) for a given incident wavelength (280 nm). The result is W = - 4.14 eV.

What does the negative sign mean?

Regards

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# Negative work function?

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