Echoes demonstrate of sound waves. Time le Select one: O a. diffraction O b. interference O c. refraction O d. reflection Two waves cross and result in a wave with a larger amplitude than either of the original waves. This is called Select one: a. phase exchange O b. negative superimposition O c. destructive interference O d. constructive interference Clear my choice A B C D Which of the diagrams of sound diffraction shown is the most accurate? Select one: Oa. A Ob. B OCC Od. D