Question

A) You are setting up a photoelectric effect experiment with an unknown metal surface. Which of...

A) You are setting up a photoelectric effect experiment with an unknown metal surface.

Which of the following wavelengths of light is most likely to cause electrons to be ejected from the surface?

700 nm

they are all equally likely to work

500 nm

300 nm

900 nm

B) Suppose you try the experiment with the light you chose in the previous question, and you get ejected electrons with a maximum kinetic energy of 2.5 eV. What will happen if you use a dimmer light of the same wavelength?

nothing will change

maximum KE will be more than 2.5 eV

maximum KE will be less than 2.5 eV

fewer electrons will be ejected

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