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Work function of sodium is 2.3 eV. Does ...

Work function of sodium is 2.3 eV. Does sodium show photo-electric emission for light of wavelength 6800 Å ?

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The threshold wavelength of sodium
` lambda _(0) = (hc)/(E) = (6.6 xx 10^(-34) xx 3xx 10^(8))/( 2.3 xx 1.6 xx 10^(-19)) = 5380 A `
As given wavelength ` lambda = 6800 A gt ` threhold wavelength ` lambda_(0) = 5380 A ` , no photoelectric emission will take place .
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