The threshold frequency for photo electric effect on sodium corresponds to a wavelength 5000 Å. Its work function is
Answer & explanation
Correct answer: option 3
$\phi=\frac{hc}{λ_0}$
$\phi=\frac{20×10^{-26}}{5000×10^{-10}}=4×10^{-19}Joule$
The threshold frequency for photo electric effect on sodium corresponds to a wavelength 5000 Å. Its work function is
Correct answer: option 3
$\phi=\frac{hc}{λ_0}$
$\phi=\frac{20×10^{-26}}{5000×10^{-10}}=4×10^{-19}Joule$