You can use an instrument that can determine the maximum kinetic energy of photoelectric effect electrons. That instrument can increase the voltage difference between the collector and emitter until the current flowing through the circuit goes to zero. This is called the stopping potential. Using this instrument, you measure this voltage to be 0.810 V for electrons emitted from a surface illuminated by 502-nm light. Then, when you change the incident light to a new wavelength value, the new voltage is 1.52 V. (Hints: KEmax is best in eV and see figure 30-6) a) What is this new wavelength? b) What is the work function for the surface?

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Chapter1: Units, Trigonometry. And Vectors
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4. You can use an instrument that can determine the maximum kinetic energy of photoelectric effect electrons. That instrument can increase the voltage difference between the collector and emitter until the current flowing through the circuit goes to zero. This is called the stopping potential. Using this instrument, you measure this voltage to be 0.810 V for electrons emitted from a surface illuminated by 502-nm light. Then, when you change the incident light to a new wavelength value, the new voltage is 1.52 V. (Hints: KEmax is best in eV and see figure 30-6) a) What is this new wavelength?

b) What is the work function for the surface?

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