Question

multiple choice question
the formation of nodes and antinodes is directly dependent on

the noise to pure tone ratio of the incoming wave
partly destructive and partly constructive interference
destructive and constructive interference
the noise to pure tone ratio of the outgoing wave

Explanation:

Nodes are points of destructive interference (where waves cancel out), and antinodes are points of constructive interference (where waves reinforce each other). The formation of these is directly due to the combination of destructive and constructive interference. The noise - to - pure tone ratio (whether incoming or outgoing) is not relevant to the formation of nodes and antinodes. Also, it's not "partly" but a full - fledged combination of destructive and constructive interference that leads to their formation.

Answer:

destructive and constructive interference