Homework, 1.15 a

[Adrian C 1D]

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km/s.
a)What is the wavelength of the ejected electron?
Not even sure where to begin.

[Chem_Mod]

Begin with the concept that Energy of a photon - Threshold Energy = Kinetic Energy, and use the corresponding formulas. A calculation will be done Wednesday.

[gwynlu1L]

You will also need Ek= 1/2 m(e)v(e)^2, since the question gives you velocity. using m= 9.109 x 10^-31kg, you can calculate the kinetic energy of the electron and then use that value to calculate the Energy of the photon. Then use E=hv, and c=wavelength x v to calculate what the wavelength is.