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The threshold frequency for photo electric effect on sodium corresponds to a wavelength 5000 Å. Its work function is |
15 Joule 10 × 10–19 Joule 4 × 10–19 Joule None of these |
4 × 10–19 Joule |
$\phi=\frac{hc}{λ_0}$ $\phi=\frac{20×10^{-26}}{5000×10^{-10}}=4×10^{-19}Joule$ |
