Calculating Wavelength of electron

[Zack Barta 3I]

If the wavelength of incident light on sodium metal was 810 nm, and the work function of
sodium is 1.1 eV, what is the wavelength of the ejected electron?

Am I correct in using de Broglie's equation because the wavelength we are trying to calculate is a particle not a photon?

I got 1.86*10^-9 m.

pls help

[janeane Kim4G]

I haven’t done the computation for this lol but you’re right to use deBroglie, as the question isn’t for a photon

[becca_vandyke_4b]

Do you use de Broglie when calculating wave length for an electron and c=lambda times frequency for a photon?

[JiangJC Dis2K]

The equation you would use is Energy (photon) - Work Function=Kinetic Energy of Electron=1/2mv^2. And then use the known value of mass of electron to solve for velocity to plug into heisenberg's.