1. The problem statement, all variables and given/known data A photon whose energy is 8.00E-15 J is scattered off an electron at a 90 degree angle What is the wavelength of the scattered wave? 2. Relevant equations i know that Lamda = hc/E =6.63E-34 * 3E8 / 8E-15 =2.48E-11m 3. The attempt at a solution Does anyone know how to find out the wavelength including the scattered angle?