Question

PHYS-1200/1250 Lab Manual Section Name 2) Return the simulation to (400 nm, Sodium target, Intensity 100%, Voltage=0V). Click on the box to enable graphing of the current vs battery voltage. Sweep the battery voltage from -8 to +8 V. Rescale the plot on the screen so you can clearly see the behavior, a) Sketch the plot in the box to the right. b) Circle the point that corresponds to the stopping potential c) Why do you think the current stops increasing for positive voltage: 3) Set the simulation to (. = 400 nm, Sodium target, Intensity I = 100%, Voltage V = +8V). Click on the box to display the Current vs Light Intensity. Vary intensity to display the graph. a) Copy the graph in the box to the right. b) If you halve the intensity, what happens to the current? This activity serves as an introduction to the upcoming photoelectric experiment. When you are doing the photoelectric experiment and questions arise go back and review this activity for clarification! 151

Answer 1

a) No

b) current increases

as positive attract all photo electrons, increasing positive potential attract electron hence number electrons reach the collector increases hence current increase.

C) current decrease

d) from lab observation need to right.

e) stopping potential does not depends on intensity of light.

It depends on frequency of light used.

f) decreasing wavelength increases stopping potential.