I already answered #1 and 2....so I only need help with #3, but i added in my an

Question

I already answered #1 and 2....so I only need help with #3, but i added in my answers for the first 2 in case you need them to help you out. Thank you :)

1.              Choose a metal and choose a wavelength that ejects electrons at a reasonable speed. Turn the light intensity up and down. Make note of the number of electrons ejected. Why does the number change? Explain, with reference to quantum theory. I started with copped at 254 nm and at an intensity of 39%. When I increased the intensity the number of photoelectrons increased as well because the number of incident of photons on the metal surface increases. That increases because a single photon produces a single electron.

                  2.              Using this same wavelength and 100% intensity, change the flow of         electricity from the battery (at the bottom of the screen), making note of the change in charge at both ends of the electron chamber. Speculate as to why the flow of electrons is changed. When I changed the battery potential to about -2 volts the electrons can no longer leave the metal because they are not emitted with kinetic energy to overcome the negative potential that is provided by the battery.

Go to

http://phet.colorado.edu/en/simulation/photoelectric

and click on Run Now.

3. Reset the battery to zero, and turn on the electron energy vs. light frequency graph at the right of the screen. Play with light wavelength to generate data for the graph. Convert electron volts into joules, then calculate the slope of the line (be sure to use the exact values used in the graph). Explain why you obtained the value you did.

Explanation / Answer

10

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