In an experiment to study the photo-electric effect, light of wavelength 400 nmshining on a metallic surface causes electrons to be emitted. The maximum kineticenergy of the electrons is 1.05 eV (electron volts). Another light source ofwavelength 200 nm is then tried, and the emitted electrons have a maximum kineticenergy of 4.20 eV. Using this information:a) determine the value of Planck's constant.b) determine the work function of the metal.

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Potassium and gold cathodes are used in a photoelectric-effect experiment. For each cathode, find: The threshold frequency. The threshold wavelength. The maximum electron ejection speed if the light has a wavelength of 170 nm . The stopping potential if the wavelength is 170 nm . Throughout this problem, be sure to use 6.63×10−34J⋅s for Planck's constant. a) The maximum photoelectron ejection speed in meters per second for an electron ejected from potassium if the light has a wavelength of 170 nm. Express your answer in meters per second. b)The maximum photoelectron ejection speed in meters per second for an electron ejected from gold if the light has a wavelength of 170 nm . c)The stopping potential in volts for potassium if the wavelength is 170 nm. Express your answer in volts. d) The stopping potential in volts for gold if the wavelength is 170 nm. Express your answer in volts.
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