1.

The threshold frequency for photoelectric effect on sodiune corresponds to a wavelength of 5000 Å. Its function is

Answer»

`4 xx 10^(-19)` J
1 J
`2 xx 10^(-19)` J
`3 xx 10^(-19)` J

Solution :`W_(0) = (hc)/(lambda_(0)) = (6.63 xx 10^(-34) xx 3 xx 10^(8))/(5000 xx 10^(-10)) J = 4 xx 10^(-19)J`


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