CHEM help!!!!!!!!!?

Question

In his explanation of the photoelectric effect, Einstein reasoned that the absorbed photon must have the minimum energy required to dislodge an electron from the metal surface. This energy is called the "work function" of that metal. What is the longest wavelength, in nanometers (nm), of radiation that could cause the photoelectric effect in sodium, for which the work function is 4.41×10-19 J?

Answer 1

Similar to your previous question on waves, E = hc / (lambda). You're given E, h and c are constants, so you can calculate the wavelength lambda. Just make sure the units work out.