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The Fig shows a plot of three curves a, ...

The Fig shows a plot of three curves a, b, c showing the variation of photocurrent versus collector plate potential for the 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 radiation have same frequency but different intensities.

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From the figure , curves a and b have same frequencies but different intensities.
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