Answer:
AN electric current is required for an electric charge
Explanation:
Depends on the elasticity and density of the medium through what it is traveling <span> </span>
The answer is constructive interference. At the point when two waves meet such that their peaks line up together, then it's called productive obstruction. The subsequent wave has a higher adequacy. In dangerous obstruction, the peak of one wave meets the trough of another, and the outcome is a lower add up to adequacy.