Question

Copper has a work function of 4.70 eV, a resistivity of 1.7x10-8Ω∙m, and a temperature coefficient of 3.9 x10-3ºC -1. Suppose you have a cylindrical wire of length 2.0manddiameter 0.50 cm connected to a variable power source; and separate thin,square plate of copper.

a.(5points) Draw a clear physics diagram showing each part of the problem.

b.(5points)At what temperature would the wire have 2.5 times the resistance that it has a t 20degrees?

c.(5 points) What is the peak wavelength of radiation emitted by a wire of this temperature

?d.(5 points) Iflightat only thewavelengthfound above were shone onto the copperplate, what would be the maximum kinetic energy of the ejected photoelectrons

Answer 1