<p>(a) The graph shows the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B. Which one of the two has higher value of work function? Justify your answer.</p>

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<p>(b)&nbsp;For the same graph of stopping potential vs frequency for metals A and B, which metal will emit photoelectrons when exposed to a light source of frequency &nu;\nu&nu;, lying between the threshold frequencies of A and B? Explain your reasoning.</p>