Final answer:
Waves of different frequencies can indeed superimpose, a fact that is fundamental in wave theory and accounts for interference patterns through constructive and destructive interactions.
Step-by-step explanation:
The statement that waves can superimpose if their frequencies are different is true. Wave superposition occurs when two or more waves pass through the same point in space at the same time, and their displacements combine to produce a resultant wave. This principle is a fundamental concept in wave theory and applies to all types of waves, whether mechanical, sound, light, or other electromagnetic waves.
Superposition can lead to various phenomena, such as interference patterns, which can be constructive (waves in phase adding together to make a larger wave) or destructive (waves out of phase canceling each other out).