Final answer:
It is true that waves can superimpose with different frequencies, wave-particle duality does not apply to macroscopic objects, and wave amplitudes only add up constructively when they are precisely aligned or in phase.
Step-by-step explanation:
Understanding Wave Interaction
Superposition of Waves with Different Frequencies: The statement that waves can superimpose even if their frequencies are different is true. Waves of different frequencies pass through each other without being altered in the process, which is the principle of superposition. This phenomenon can result in various interference patterns, but the individual waves continue on their original paths with their original frequencies intact.
Wave-Particle Duality on the Macroscopic Scale: The concept of wave-particle duality primarily applies to quantum particles, and it is false that this duality exists for objects on the macroscopic scale. In quantum mechanics, particles such as electrons can exhibit both wave-like and particle-like properties, but macroscopic objects do not exhibit such duality.
Effect of Amplitude on Waves: Regarding whether the amplitude of one wave is affected by the amplitude of another wave only when they are precisely aligned, the statement is true. This is a description of constructive interference, where two waves in phase can add their amplitudes. Similarly, if two waves are propagating in the same line, their amplitudes add up only when they are in phase, which is also true.