(Answered) Question the stopping potential for photoelectrons emitted

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Question: The stopping potential for photoelectrons emitted from a photocathode surface illuminated by light of wavelength 491nm is 0.63V. When the wavelength is changed to a new value, the stopping potential is found to be 1.43V.

a. What is the new wavelength?

b. What is the work function of the surface?

c. Use Table to identify the material of which this photocathode might be made.

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