Answer to Question #180548 in Molecular Physics | Thermodynamics for Stan jacob

Question

What is the maximum wavelength of electromagnetic radiation that can eject photoelectrons from a metal with work function of 3.9 eV?

Answer 1

The maximum wavelength of electromagnetic radiation that can eject photoelectrons from a metal is

$E_{phot}=\displaystyle \frac{hc} {\lambda_{max}}= A_{out}$

$\displaystyle \lambda_{max} = \frac{hc}{A_{out}}$

$\displaystyle \lambda_{max} = \frac{6.626 \cdot 10^{-34}\cdot 3 \cdot 10^8}{3.9 \cdot 1.6 \cdot 10^{-19}} = 3.185 \cdot 10^{-7} = 318.5 \cdot 10^{-9} \;m = 318.5 \; nm.$

Answer: 318.5 nm.