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The work function \( (\phi) \) of some metals is listed below. The number of metals which will show photoelectric effect when light of \( 300 \mathrm{~nm} \) wavelength falls on the metal is :-
\( \mathrm{P} \)
\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|}
\hline Metal & \( \mathrm{Li} \) & \( \mathrm{Na} \) & \( \mathrm{K} \) & \( \mathrm{Mg} \) & \( \mathrm{Cu} \) & \( \mathrm{Ag} \) & \( \mathrm{Fe} \) & \( \mathrm{Pt} \) & \( \mathrm{W} \) \\
\hline\( \phi(\mathrm{eV}) \) & 2.4 & 2.3 & 2.2 & 3.7 & 4.8 & 4.3 & 4.7 & 6.3 & 4.75 \\
\hline
\end{tabular}
\( \mathrm{W} \)
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