\fTEAM Procedure (real lab): Turn on the instrument and allow it to heat for five minutes. Position the light source in the 25 cm position. Caution: Prevent stray light from entering the dark-box directly. Then insert the red color filter into the drawtube, turn light intensity up to high, set the current multiplier to "x0.001" and change voltage direction to "-". Adjust the accelerate voltage until the photo current is zero, switch the display mode to view the voltage and record the voltage ( you need to make a table with five columns and record the filter color, its relevant wavelength, the frequency, the stopping potential and finally Kmax each in a separate column). Repeat this process for each of the filters, recording the voltage value for each wavelength and fill out the following table: Table 1 Color of Filter Wavelength (nm) Frequency (Hz) Stopping Potential (V) Kmax (ev) Kmax ( Red 635 4.72x10^14 -0.31 0.31 4.96x10^-20 Orange 570 5.26x10^14 -0.50 0.50 8.00x10^-20 Yellow 540 5.56x10^14 -0.66 0.66 1.06x10^-19 Green 500 6.00x10^14 -0.81 0.81 1.30x101-19 Blue 460 6.52x10^14 -1.01 1.01 1.62x10^-19 Percent error (J): 4.92% Computation and analysis: Percent error (ev): 5.40% Part 1. Use Excel to plot the Kmax in eV (vertical axis) versus the frequency and find the best fit line to your data points and write the equation of the line (with at least 4 significant figures of accuracy) on the graph. From the slope of the graph find the Planck's Constant and calculate your percentage of error. Show all your calculations: Part 2. You need to determine the material of the Cathode of your equipment which is unknown