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Question: Assuming that each photon liberates an electron, estimate the pressure exerted by the photoelectrons on the positive lectrode which has an area of 3.0 x 10^-4m^2. ( You may assume that all the photoelectrons emmited are absorbed by the positive electrode.)

In the exam, I gave the answer in terms of distance, d, which is the distance between the metal and the positively charged electrode. Am I right to say that this question is unqorkable if no distance is provided?