A.
Waves that vibrate in a vertical plane(standing upright)
B.
The motion of the source toward the observer
C.
The motion of the source away from the observer
D.
waves that reflect off a boundary and interfere with themselves
Correct Answer: Option D
Explanation
Standing waves are formed when waves reflect back from a boundary and interfere with the incoming waves of the same frequency and amplitude, creating points that appear to stand still (nodes) and points of maximum oscillation (antinodes).
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