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

The work function `(phi)` of some metals is listed can have principal quantum of metals which will show photoelectric effect when light of `300` nm wavelength falls on the metal is Metal `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 ` respectively.

Text Solution

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The correct Answer is:
4
`E_("photon")=12400/3000=4.13 ev`
Photoelectric effect can take place only if `E_("photon") ge phi`
Thus,
`Li, Na, K, Mg` can show photoectric effect.
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