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The photon is the quantum of the electromagnetic four-potential, and therefore the massless bosonic particle associated with the electromagnetic force, commonly also called the "particle of light". Use this tag for questions about the quantum-mechanical understanding of light and/or electromagnetic interactions.
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Is there a material with work function less than 1 eV?
I think most of the materials have work function above 2 eV (most common materials). The poster you shared, I don't think it is outdated. Of course, a lot of materials can be made and synthesized with …