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Stopping potential against frequency graphs of two metals: compare work functions

The same question, asked 2 times: 3 May 2023 S2, 15 May 2023 S2. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    27
    The graph of stopping potential 'VsV_s' against frequency 'vv' of incident radiation is plotted for two different metals 'X' and 'Y' as shown in graph. 'ϕx\phi_x' and 'ϕy\phi_y' are work functions of 'x' and 'Y' respectively then

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  2. Question 2

    15 May 2023 S2

    45
    The stopping potential as a function of frequency of incident radiation is plotted for two different photoelectric surfaces A and B. The graph shows that the work function of A is

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