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The work function for the following meta...

The work function for the following metals is given
Na: 2.75V, K:2.30eV, Mo:4.17eV, Ni:5.15eV
Which of these metals will not give photoelectron emission fro a radiation of wavelength `3300 oversetcircA` from a He-Cl laser placed 1 m away from the photocell?

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