Question: When a certain photoelectric material is illuminated with red light ( = 700 nm) and then blue light ( = 400 nm), it is found

When a certain photoelectric material is illuminated with red light (λ = 700 nm) and then blue light (λ = 400 nm), it is found that the maximum kinetic energy of the photoelectrons resulting from the blue light is twice that from red light. What is the work function of the material?

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