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The work function of aluminium is 4.2 eV...

The work function of aluminium is `4.2 eV`. If two photons , each of energy `3.5 eV` strike an electron of aluminium , then emission of electrons will be

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W_0 =4.2V.
E = Energy of photon = 3.5 eV
`E= W_0+K.E `
`K.E.=E-W_0`
For photoelectric emission to take place , energy of incident photon should be greater than the work function of metal.
Here, `E lt W_0`
`:.` Photo electric emission is not possible.
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