Answer:
They will interfere to create a crest with an amplitude of 4.
Step-by-step explanation:
When the waves meet, their energy is added together in a process called interference. At the point where a crest from one wave meets the crest from another wave, constructive interference occurs. This is known as the principle of superposition. The superimposed waves will create a crest that is greater than that of either wave alone. In fact, it will be equal to the sum of the amplitude of the two crests.
1+3=4