A wave<span> in a medium in which each point on the axis of the wave has an associated constant </span>amplitude<span>. The locations at which the amplitude is minimum are called </span>nodes<span>, and the locations where the amplitude is maximum are called </span>antinodes<span>. (most of these aren't my own words but I tried to put some in my own words) :)</span>
They were published in 1542.
I’m pretty sure the answer is C. Any change of state or movement requires energy
