The work function for \( \mathrm{Al}, \mathrm{K} \) and \( \mathrm{...

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The work function for \( \mathrm{Al}, \mathrm{K} \) and \( \mathrm{Pt} \) is \( 4.28 \mathrm{eV} \), \( 2.30 \mathrm{eV} \) and \( 5.65 \mathrm{eV} \) respectively. Their respective
\( \mathrm{P} \) threshold frequencies would be

W
(a) \( \mathrm{Pt}\mathrm{Al}\mathrm{K} \)
(b) \( \mathrm{Al}\mathrm{Pt}\mathrm{K} \)
(c) \( \mathrm{K}\mathrm{Al}\mathrm{Pt} \)
(d) \( \mathrm{Al}\mathrm{K}\mathrm{Pt} \)
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