The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? (a) Curves (a) and (b) represent incident radiations of same frequency but of different intensities. (b) Curves (b) and (c) represent incident radiations of different frquencies and different intensities. (c) Curves (b) and (C) represent incident radiations of same frequency having same intensity. (d) Curves (a) and (b) represent incident radiations of different frequencies and different intensities

Answer: (a). Same stopping potential means same frequency; different saturation current means different intensity. Curves a and b share the stopping potential but saturate at different currents. Curves b and c have different stopping potentials (different frequencies) but the same saturation current (same intensity). So the answer is (a).

The figure shows a plot of photo current versus anode potential for a… | NEET 2009 (AIPMT)

Q73NEET 2009 · AIPMTMedium

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

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Answer: (a)

Same stopping potential means same frequency; different saturation current means different intensity.
Curves $a$ and $b$ share the stopping potential but saturate at different currents.
Curves $b$ and $c$ have different stopping potentials (different frequencies) but the same saturation current (same intensity).
So the answer is (a).

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