Light coming from a discharge tube filled with hydrogen falls on the cathode of the photoelectric cell. The work function of the surface of cathode is 4 eV. Which one of the following values of the anode voltage (in volts) with respect to the cathode will likely to make the photo current zero.
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Question

Light coming from a discharge tube filled with hydrogen falls on the cathode of the photoelectric cell. The work function of the surface of cathode is 4 eV. Which one of the following values of the anode voltage (in volts) with respect to the cathode will likely to make the photo current zero.

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G1 Physics · Accepted Answer

At fixed frequency above threshold, increasing intensity increases the photon flux and hence the saturation current, but does not change Kₘₐₓ or the stopping potential. Frequency controls Kₘₐₓ through Kₘₐₓ = hν−φ. Final: D: − 10.