Pierce conducts an experiment in which waves collide in a way that the energy increases, which means that interferencedestructive interference has occurred.

i personally think it is constructive interference due to pierces experiments that mainly resulted in a wave collision where energy increased and created a higher amplitude.

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer