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**1. What is the wavelength of a 5.0 eV photon?**

What is the de Broglie wavelength of a 5.0 eV electron?

What is the de Broglie wavelength of a 5.0 eV electron?

**2.E = hc/lambda**

lambda = h/momentum

lambda = h/momentum

**3. I know the first one simply 248 nm for the wavelngth.**

I don't know how to find the de Broglie though since I don't know what the momentum of the electron is.

I don't know how to find the de Broglie though since I don't know what the momentum of the electron is.