Question

What is the required wavelength for ejection of an electron

Answer 1

$\large\mathbb \blue{\fcolorbox{blue}{black} { \ VERIFIED\ ANSWER \ }}$

The minimum energy required to eject an electron from the surface is called the photoelectric work function. The threshold for this element corresponds to a wavelength of 683 nm. Using this wavelength in the Planck relationship gives a photon energy of 1.82 eV.