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Homework Statement
In a photoelectricc experiment,electrons are emitted from a surface illuminated by light of wavelength of 4000*(10^-10), and the stopping potential for these electron is found to be 0.5V. what is the longest wavelength of light that can illuminate this surface and still produce photoelectric current.
Homework Equations
not sure
The Attempt at a Solution
i need help to start the question because i have to clue how to start it... so could someine give me a hint on how to start it..NOT ASKING FOR ANSWER