1. The problem statement, all variables and given/known data What do interference and diffraction have in common? We are learning the sound waves, but I would like to know all the things they have in common. 2. Relevant equations x2-x1=λ/2 (contructive) 3. The attempt at a solution The waves have the same frequency, after the process (interference or diffraction) they don't change; The waves keep having the same frequency (the source doesn't change); They have the same speed and length as they had before, because the environment doesn't change.Can you tell me something else they have in common?