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Please answer both 3. The stopping potential that prevents electrons from flowing across a certain photocell is 4.0 V. What is the kinetic energy given

Please answer both

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3. The stopping potential that prevents electrons from flowing across a certain photocell is 4.0 V. What is the kinetic energy given to the electrons by the incident light? (answer in both J) KE = -qV. 4. The threshold frequency of sodium is 5.6 x 1014Hz. a. What is the work function W. of sodium? b. Sodium is illuminated by light of f = 8.6 x 1014Hz. What is the kinetic energy of the ejected electron? (KE = hf - hf. h = 6.63 x 10-34J/Hz W. = hf.)

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