Copper has a work function of 4 70 eV a resistivity of 1 7

Last updated: 5/13/2023

Copper has a work function of 4 70 eV a resistivity of 1 7 x108 m and a temperature coefficient of 3 9 x10 C 1 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 of the problem b 6 points At what temperature would the wire have 5 times the resistance that it has at 20 C c 3 points Use Wien s Law Eq 14 24 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