31. one point, from Lectures 31 and 32, short answers and one energy diagram

(a) .2 Spectra. Draw and label the discrete hydrogen spectrum. (.1) Draw and label a continuous spectrum at two temperatures, such as for tungsten. (.1) Label the axes, the colors, and draw the lines carefully, with labels where appropriate. You must have each spectrum correct to get credit for it.

(b) .2 Einstein's Photoelectric Effect (Nobel Prize 1921). What type of light can release electrons from matter? (.1) How many photons does it take to release an electron? (.1)

(c) .3 Photoelectric Energy Diagram. Draw a (labeled) simple graph of E versus f for the freed electrons. (.2) Indicate on the diagram the kinetic energy of the electron. (.1) Note I am not asking you for the whole photoelectric diagram and will deduct .2 if you draw it.

HW3A is over Lectures 29 through 34, which is Wed Nov 19. Stay up to date on lectures early in Unit 3! Thursday, November 27, is Thanksgiving.

Revised November 9, 1997.