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The figure VSAQ 29 shows a plot of three...

The figure VSAQ 29 shows a plot of three curves a,b,c, showing the variation of photocurrent in collector plate potential for three different intensities `I_1`, `I_2` and `I_3` having frequencies `v_1`, `v_2` and `v_3` respectively incident on a photosensitive surface. Point out the two curves for which the incident raidations have the same frequency but different intensities.

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