Given an electron beam whose electrons have kinetic energy of 10.0 kev, what is the minimum wavelength λmin of light radiated by such beam directed head-on into a lead wall? express your answer numerically in nanometers.

To answer the problem we would be using this formula which isE = hc/L where E is the energy, h is Planck's constant, c is the speed of light and L is the wavelength

L = hc/E = 4.136*10-15 eV·s (2.998x10^8 m/s) / 10^4 eV

= 1.240x10^-10 m

= 1.240x10^-1 nm