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The work function (phi) of some metals ...

The work function `(phi)` of some metals is listed below. The number of metals which will show photoelectric effect when light of `300` nm wavelength falls on the metal is
`((Me t a l ,Li, Na , K , Mg, Cu, Ag , Fe , Pt, W),( phi(eV), 2.4, 2.3, 2.2, 3.7, 4.8, 4.3, 4.7, 6.3, 4.75))`

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The correct Answer is:
`4.14eV`
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