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The following table gives the values of work functions for a few sensitive metals. S. No. Metal Work function(eV) 1 Na 1.92 2 K 2.15 3 Mo 4.17 If each of these metals is exposed to radiations of wavelength 3300nm, which of these will not exit photoelectrons and

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The following table gives the values of work functions for a few sensitive metals.
S. No. Metal Work function(eV)
1 Na 1.92
2 K 2.15
3 Mo 4.17
If each of these metals is exposed to radiations of wavelength 3300nm, which of these will not exit photoelectrons and why?

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