Standing wave: result of two wave trains of the same wavelength, frequency, and amplitude traveling in opposite directions through the same medium.
Interference pattern in standing waves remains relatively stationary (unlike general interference).
Node (Nodal Point)
Node: a point that remains at rest throughout the interference.
Designation: the letter "N".
Equal-Amplitude Opposite-Traveling Pulses
When equal amplitude and length pulses travel in opposite directions, a nodal point exists where displacement is zero at all times.
Physical Interpretation
At a node, the upward displacement is cancelled by the downward displacement at each moment.
Diagram Reference (conceptual)
Two pulses of equal wavelength and amplitude approach and pass through each other; the nodal point location is shown, illustrating cancellation at the node.