Physics Waves PMDC 2021
PMDC Verified Question 89 of 125
Stationary waves
A
Move forward
B
Move backwards
C
Don't Move
D
Move in both direction
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Don't Move
Concept:

Stationary waves (also called standing waves) get their name directly from their macroscopic behavior.

Solution:

  • They are created by two identical progressive waves traveling in opposite directions.


  • When they superimpose, the resulting wave profile (the nodes and antinodes) remains locked in fixed spatial positions.


  • While the medium particles oscillate up and down, the wave profile itself does not move or propagate through space.


Why other options are incorrect:

Progressive waves move forward or backwards. Stationary waves, by definition, lack a net velocity vector for their energy profile.

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