Problem 4 Copper has a work function of 4.70 elf, a resistivity of 1. 7x103 .0 -m, and a temperature coefficient of 3.9 x103 901. Suppose you have a cylindrical wire of length 2.0 m and diameter 0.50 cm connected to a variable power source; and a separate thin, square plate of copper. [a] (5 points) Draw a clear physics diagram showing each part ofthe problem. (b) (6 points) At what temperature would the wire have 5 times the resistance that it has at 20 E'C'? (c) (3 points) Use Wien's Law (Eq 1424) to find the peak wavelength of radiation emitted by a wire of this temperature. (d) (6 points) If light at only the wavelength found above were shone onto the copper plate, what would be the maximum kinetic energy of the ejected photoelectrons