State the relationship and draw the reflected and transmitted wave pulse. Two waves travel through one another. How do you know if the resultant amplitude will be greater or smaller than the individual amplitudes. It depends on whether constructive or destructive interference occurs. Constructive interference allows for crest on crest situations which results in greater amplitudes.
Destructive interference allows for crest on trough situations which results in lesser amplitudes.
Therefore the waves cancel each other out. Loud cheering at a sporting event that travels hundreds of yards. Constructive interference of crest on crest and trough on trough. Diffraction of longer red wavelengths going around atmosperic particles and shorter blue wavelengths reflecting off atmospheric particles. Prism separating white light into colors.