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The work function for sodium metal is 2....

The work function for sodium metal is `2.46eV`. Determine the cutoff wavelength for sodium?
Strategy: The cutoff frequency `v_(0)` is related to the work function through the relation `v_(0) = W_(0)//h`. This corresponds to a cutoff wavelength of `lambda_(0) = (C )/(v_(0)) = (C)/(W_(0)//h) = (hc)/(W_(0))`. wavelength grater than `lambda_(0)` for a metal with work function `W_(0)` produce no photoelectric effect.

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