Question: The work functions for sodium, cesium, copper, and iron are 2.3, 2.1, 4.7 and 4.5 eV, respectively. Which of those metals will not emit electrons

The work functions for sodium, cesium, copper, and iron are 2.3, 2.1, 4.7 and 4.5 eV, respectively. Which of those metals will not emit electrons when visible light shines on it?

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