Lead is to be deposited at a cathode from a solution that is 0.150 M in Pb21 and 0.215 M in HClO4. Oxygen is evolved at a pressure of 0.850 atm at a 30-cm2 platinum anode. The cell has a resistance of 0.900 V. (a) Calculate the thermodynamic potential of the cell. (b) Calculate the IR drop if a current of 0.220 A is to be used.

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.