Practice portal › Dual Nature of Matter and Radiation › Conceptual and Statement Questions on the Photoelectric Effect
Asked in NEET 2020 · Conceptual points of the photoelectric effect
The incident frequency is u=1.5 u₀, comfortably above the threshold, so emission does happen to begin with.
Halving it: u'=(1.5 u₀)/2=0.75 u₀.
Now 0.75 u₀< u₀, so each photon carries less than the work function and cannot free an electron.
Doubling the intensity sends twice as many photons per second, but photoemission is a one-photon-one-electron process, so two weak photons do not combine to free one electron.
The photoelectric current is therefore zero.
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