Assume that the frequency of the incident light is large enough to overcome the

Question

Assume that the frequency of the incident light is large enough to overcome the work function, i.e., the photoemission of electrons is already occurring. How does the number of photoelectrons emitted from a metal surface change with light frequency increase? Does the number of photoelectrons emitted from a metal surface depend on the light intensity? Consider two photoelectric photocells that have cathodes made from different materials. The incident light has the same frequency for both photocells. Would the stopping voltage be the same for both photocells?

Explanation / Answer

1. The number of photoelectrons emitted from the metal surface does not change with the increasing frequency. Frequency only determines the energy of the emitted electrons since energy is proportional to frequency.

Yes. The number of photoelectrons emitted from the metal surface increases with the increase in intensity (provided work function has been overcome, which is done in this case).

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