Final answer:
Both constructive and destructive interferences can lead to detectable diffraction patterns; the former amplifies while the latter diminishes the resultant wave's amplitude.
Step-by-step explanation:
The kind of interference that leads to detectable diffraction can be either constructive interference or destructive interference. Constructive interference occurs when two identical waves are in phase, increasing the amplitude and resulting in a louder sound or a brighter light at the point of interference. In contrast, destructive interference happens when identical waves are exactly out of phase, or shifted by half a wavelength, cancelling each other out and producing a softer sound or dimmer light at the point of interference. When considering wave behavior, such as in acoustics or optics, both kinds of interference are significant for explaining phenomena like the distribution of sound in a room or the pattern seen in a diffraction experiment.