1.1 The work function of barium and tungsten are 2.5' eV and 4.2 eV, respectively. Check whether these materials are useful in a photocell, which is to be used to detect visible light.
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![PROBLEMS
1.1 The work function of barium and tungsten are 2.5' eV and 4.2 eV, respectively. Check whether
these materials are useful in a photocell, which is to be used to detect visible light.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3207731a-1bb5-4404-bb09-0fe28cc1b46e%2F732b1145-4b90-4e24-bc2d-ec4a42e80d5b%2Fpktgvvi_processed.jpeg&w=3840&q=75)
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