A monochromatic light beam is incident on a barium target
Chapter 40, Problem 6(choose chapter or problem)
A monochromatic light beam is incident on a barium target that has a work function of 2.50 eV. If a potential difference of 1.00 V is required to turn back all the ejected electrons, what is the wavelength of the light beam? (a)355nm (b)497 nm (c) 744 nm (d) 1.42 pm (e) none of those answers
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