Is this document missing answers? , Get answers Get FREE answers and explanations tron" our expert tutors 4. The cutoff voltage is a measure of the maximum kinetic energy of the electrons ejected from the photoelectric surface. Using a table similar to the following, determine the maximum kinetic energy of the photoelectrons in both electronvolts and joules. W'hich colour of light has the highestenergy photons? Explain your answer. Table 2. Kinetic ener-y determination for nhotoelectrons light cutoff Maximum EL, of ejected light wavelength, It voltage, VG electrons frequency, f {V} . {Hz} .5. Using the relationship c = f it, determine the frequency of each colour. Plot a graph of the maximum kinetic energy of the ejected electrons, in joules, versus frequency, in hertz. The energy axis should have a negative axis equal in magnitude to the positive axis, and the frequency should begin at zero. To simplify the graph, use scientific notation for the scales on both axes. How are the two variables related? 6. Find the slope of the graph for energy versus frequency. The accepted value for this slope is Planck's constant (66.3 K 10 '34 J's}. Calculate the percent error for the experimental value. 7. If the graph line is extrapolated, it has intercepts on both the energy and frequency axes. The magnitude of the negative intercept on the energy axis represents the work function (VLF), which is the energy required to release the electron from the photoelectric surface. Determine the work function for cesium? What is the significance of the negative value? 8. The intercept on the frequency axis represents the threshold frequency [fa], or the minimum frequency of the photons of light that will cause electrons to be ejected from a cesium surface. Determine the threshold frequency and the threshold wavelength for cesium? 9. Using the slope and intercept values above, write a general equation describing the graph in the mathematical form y = mx + b. 10. W'rite a conservation of energy equation using the variables Ephcm EL, and W. Rearrange the equation into the mathematical form y = mx b. Recall the equation relating energy and frequency of a photon. 11. Below is the data collected for two other photoelectric cathodic materials. Make the appropriate calculations and plot the data on the graph in step 5. Observation Chart Colour Yellow Green Blue Violet Wavelength 578 nm 546 nm 480 nm 410 nm 410 nm low- high- intensity intensity Retarding Photo- Photo- Photo- Photo- Photo- potential current current current current current (V) (HA) (HA) (HA) (HA) 0.00 3.2 10.4 11.2 8.5 14.8 0.05 2.3 8.7 10.1 8.1 14.0 0.10 1.3 7.1 9.0 7.6 13.3 0.15 0.6 5.5 8.0 7.2 12.6 0.20 0.2 4.0 7.0 6.7 11.9 0.25 0 2.4 6.0 6.2 11.1 0.30 1.0 4.9 5.7 10.4 0.35 0.2 3.8 5.3 9.6 0.40 0 2.8 4.8 8.9 0.45 0 1.7 4.4 8.2 0.50 1.2 3.9 7.0 0.55 0.7 3.4 5.7 0.60 0.4 3.0 6.0 0.65 0.1 2.5 5.2 0.70 0 2.0 4.5 0.75 1.6 3.7 0.80 1.1 3.0 0.85 0.9 2.3 0.90 0.7 1.7 0.95 0.5 1.2 1.00 0.3 0.8 1.05 0.2 0.4 1.10 0. 1 0. 1 1.15 0 1.20Table 3. Frequencies and cut-off voltages for barium and calcium barium calcium frequency, f cut-off voltage, V (V) frequency, f cut-off voltage, V (V) (x 10 4 Hz) (x 10 4 Hz) 6.25 0.10 8.50 0.20 6.55 0.25 9.25 0.50 7.00 0.40 10.0 0.80 7.50 0.65 11.0 1.25