The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. Which graph correctly shows the variation of photocurrent I with λ? Image
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The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. Which graph correctly shows the variation of photocurrent I with λ? Image

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: B: Image 2.