I was wondering about the answers for the last 2 concluding questions.

electron he Physics 30: Name:_ Negar Fathi 3) Create a graph of the kinetic energy in (ev) of the photoelectrons as a function of the Photoelectric Experiment Period: _4 incident frequency ( x 10" Hz) of light on the photoelectric surface. Give it a nice title. the Problem Statement: 4) a) Calculate the slope of the line of the graph. (show your work) he What is the relationship between the maximum kinetic energy of a photoelectron emitted from a photoelectric surface and the frequency of the photons incident on that surface? Hick = (2. 0ev- 0.700) = 4. 95 x 10 dev-s Data Collection: The experiment data is obtained from a video. Record the color of the light, wavelength of the light, and the stopping voltage. b) Convert the slope into Is units. (show your work) Observation Table Analysis Table Frequency 1.60x105 =7. 92x10 is Color Wavelength Stopping Kinetic 4. 95 x1 jesx - nM Voltage (v) f, (Hz) Energy Ek lev ( ev ) yellow 0.25 5. 19 x 134 10. 25 c) These two numbers from part a & part b should look familiar. What does the slope of the line represent? green 0 . 35 5, 50 * 10 4 10.35 blue Planck's constant 1.05 6.88 x 10 140 5 1. 30 7. 41 * 1014 1. 30 5) Using the graph determine the x & y intercept values and explain what each 1. 70 8.22 ND' 19.1. 70 represent using a sentence. (show your work) X- intercept - threshold Frequency ( lowest amount { frequens) -4. 8 75 x184 HZ Data Analysis: 1) Calculate the maximum kinetic energy of the photoelectrons in electron volts (eV) y- intercept - walk function ( 2 . 4 4 ev ) for each of the colors and complete the data table above.(show your work for one sample calc) E= 4 x 10 ? 1 x lev Em = (0. 25 v ) ( 1. 6 x 10" ( ) 1. 6 x 15 723 Concluding Questions: 1) During the experiment light was cast upon the photoelectric surface (the metal) and E : 0. 25 electrons were photo-emitted. The photo-current was measured by an ammeter, and Emma = 4 x 10 3 for each frequency of light this photo-current was reduced to zero by adjusting the power supply. Using words, physics formulae and a diagram explain why this step is necessary for the lab. E = qu stop 2) Using the wavelengths convert these to frequency (Hz) and fill in the analysis table. (show your work for one sample calc) 2) Using your graph and knowledge about photoelectric effect, state the relationship between the maximum kinetic energy of a photoelectron emitted from a photoelectric surface and the frequency of the photons incident on that surface using words and an equation. E = hf- w Excf 2