2. The shortest distance between the two points on a wave in phase is (K/U) a. period b. amplitude c. frequency d. wavelength. 3. When a transverse mechanical wave reflects from the interface of medium of higher density, (K/U) a. the pulse returns on the same side as the incident pulse. b. the pulse is diffracted in the new medium. c. the pulse returns on the opposite side as the incident pulse. d. the pulse is refracted and has a lower frequency