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JEE Main 2006 (AIEEE) · Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Photoelectric Experiment: Intensity, Stopping Potential & Graphs question from JEE Main 2006 (AIEEE)

Q77JEE Main 2006 · AIEEEMedium

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

The anode voltage of a photocell is kept fixed. The wavelength $\lambda$ of the light falling on the cathode is gradually changed. The plate current $\mathrm{I}$ of the photocell varies as follows

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Answer: (b)

As $\lambda$ increases, photon energy $hc/\lambda$ decreases and the plate current falls.
At the threshold wavelength $\lambda_0$ the current becomes zero.
So the answer is (b), the curve decreasing to zero at $\lambda_0$ .

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