Question
The ground state of a certain type of atom has energy $–E_o$. What is the wavelength of a photon with enough energy to ionize an atom in the ground state and give the ejected electron a kinetic energy of $2E_o$?
1. $\dfrac{hc}{3E_o}$
2. $\dfrac{hc}{2E_o}$
3. $\dfrac{hc}{E_o}$
4. $\dfrac{2hc}{E_o}$