Move the slope tool to 0.2 seconds on the graph. Select the Slope tool from the graph tool palette. Measurements for Time 0.2 s: Click on the position graph to make that graph active. On the second plot area below the Position plot, select Velocity on the vertical axis. During the experiment, each time a different filter is applied, the user clicks “Keep” in PASCO Capstone and the value of the stopping voltage for that frequency is recorded and automatically graphed vs. In the graph, click on the Add a Plot Area tool in the toolbar. PASCO Capstone automatically recognizes these instruments and can read the current and the voltage. Use the 850 Universal Interface and PASCO Capstone to collect and analyze data.īoth the picoammeter and the power supply for the stopping voltage have sensor ports on the front that connect to the analog sensor ports of the 850 Universal Interface. Will scale the graph so that all of the Data will be included in the graph, or it will scale to the size of the highlight box on screen. The concept that the stopping voltage does not change with light intensity is tested using the various apertures that change the light intensity by partially blocking the light. Scaling the Graph 1 These functions allow you to zoom in and out on your data to see fine detail or the total picture.
the frequency, and Planck’s Constant is determined from the slope of the graph.
The voltage is then adjusted to stop the photoelectric current. The metal plate in the photodiode is illuminated with various frequencies of light, selected from a mercury lamp using filters. You need to know these definitions for the Cambridge test. PASCO Capstone is a feature-rich data acquisition, visualization, and analysis program designed for advanced science education. First do all editing in CAPSTONE correct x and y axis, label both axes, and give a graph title in lower left hand corner. This apparatus uses the conventional method of determining Planck’s Constant. Here is a list of definitions from the IGCSE, AS and A-Level Syllabi. To prepare a copy for your lab report, open the document in CAPSTONE.
The Photoelectric Effect System is used to perform the photoelectric experiment, determining Planck’s Constant to within 5%.