Question: You wish to pick an element for a photocell that will operate via the photoelectric effect with visible light. Which of the following are suitable

You wish to pick an element for a photocell that will operate via the photoelectric effect with visible light. Which of the following are suitable (work functions are in parentheses): tantalum (4.2eV) tungsten (4.5eV) aluminum (4.2eV) barium (2.5eV) lithium (2.3eV)?

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