Posted by bill on Friday, September 3, 2010 at 11:28pm.
If the intensity level is in Watts, there will be fewer photons per second hitting the potassium because each photon carries more energy.
You need to know how the quantum efficiency for photoemission varies with wavelength in order to answer this question.
If the quantum efficiency is constant with wavelength between 450 and 500 nm, the photoemission current will go down, but there will be more energetic electrons.
Out of these choices what would you say?
1. The same number of electrons would be emitted, but they would have a lower velocity
2. The same number of electrons would be emitted, but they would have a higher velocity
3. No electrons would be emitted from the surface.
4. More electrons would be emitted from the surface.
5. Fewer electrons would be emitted from the surface.
Nevermind I figured it out myself.
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