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Jan 9, 2024

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Katya Milyard PHY112 23138 6/9/23 Photoelectric Effect Lab Purpose/Question : The purpose of this lab is to explore the correlation and relationship between the frequency of the light used to free an electron from a metal source and the maximum kinetic energy of a free electron. Materials : ● Phet photoelectric effect simulation Procedures : 1. Download the Phet simulation for the photoelectric effect. 2. Play around with the brightness and wavelength lamp controls and observe the behavior of the freed electron a. The wavelength setting of the lamp controls that color of the light that is emitted from the lamp. In this particular simulation, the lamp can be set to emit specific wavelengths that are below and above the light range that is visible to the eye. b. The intensity setting of the lamp controls the brightness. This setting relates to the number of photons that are emitted by the lamp in the simulation. 3. Change the voltage setting and observe how the freed electrons behave. a. The voltage of the battery can be set to a positive potential on either plate in this simulation. 4. Put the lamp at a specific wavelength that causes an electron to become free and record the wavelength. 5. Figure out the voltage of the battery needed to drop the current to zero causing a stop in the potential. 6. Change the light wavelength and repeat the entire process until you collect a minimum of 10 data points. 7. Using the wavelength, calculate the frequencies for all the light photons. 8. Using the stopping potential, calculated the maximum kinetic energy of the electron that became free using the SI units for energy. 9. Make a graph in excel of frequency vs energy with frequency on the horizontal axis and energy on the vertical. Put in the line of best fit with the equation on the graph. Photograph(s) of Experiment :

Name: Katya Milyard Date: 6/10/23 Section: 23138 Data : Wavelength (lambda) Stopping Potential (volts) Frequency (Hertz) Maximum Kinetic Energy (Joules) 476 -.3 6.29 x 10^14 4.8x10 ^-20 404 -.9 7.42 x 10^14 1.44 x 10 ^ -19 448 -.5 6.69 x 10^14 8.0 x 10 ^ -20 390 -1.3 7.69 x 10^14 2.08 x 10 ^ -19 420 -.7 7.14 x 10^14 1.12 x 10^ -19 437 -.7 6.86 x 10^14 1.12 x 10^ -19

467 -.3 6.42 x 10^14 4.8x10 ^-20 489 -.3 6.13 x 10^14 4.8x10 ^-20 456 -.5 6.57 x 10^14 8.0 x 10 ^ -20 423 -.7 7.09 x 10^14 1.12 x 10^ -19 Calculations and Graphs : Calculations: Frequency calculation: c=(lambda)f Ex: 3x10^8= (476x10^-9)f f=6.3x10^14 Hz Maximum kinetic energy calculation: K=qV Ex: K=(1.6x10^-19)(.3V) K=4.8x10 ^-20 J Graphs: Results : This graph portrays a positive linear relationship between frequency and kinetic energy with a line of best fit equation of y = 1E-33x - 6E-19 and roughly a 92% correlation in this graph.

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