Question: A student conducted a Millikan-Style experiment to identify an unknown material. A variable frequency light source was directed at a surface of the unknown

variable frequency light source was directed at a surface of the unknown

A student conducted a Millikan-Style experiment to identify an unknown material. A variable frequency light source was directed at a surface of the unknown material. A photoelectric current was observed, and the stopping voltage required to halt the current was recorded. Flag a) In the answer box below, calculate the Maximum Kinetic Energy (Ek photoelectrons for each row of the table. for the b) Plot a graph of Ek versus incident frequency. UPLOAD YOUR GRAPH. c) Calculate Planck's Constant from the graph. SHOW YOUR WORK. d) Use the graph to identify the unknown material based on the following table of known work-function values. SHOW ALL WORK. Material Zinc Aluminium Magnesium Calcium Sodium Rubidium Work Function (eV) 4.3 4.1 37 28 2.3 2.1 a) Please type the values for into the table below: - Q ht F reqy_ Pot Engcgy_te Planck's Constant was experimentally determined to be:

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