Physics Waves ETEA 2018
PMDC Verified Question 104 of 125
Which one of the following is not a characteristic of stationary wave?
A
Half wavelength is the distance between the adjacent nodes
B
Amplitude is not the same
C
Phase is identical between two adjacent nodes
D
Energy of the stationary waves travels outwards
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Energy of the stationary waves travels outwards
Concept:

Stationary (standing) waves trap energy within fixed physical boundaries rather than transmitting it through space.

Solution:

  • A defining feature of a stationary wave is that the net power flow across any vertical section is zero. Energy is strictly exchanged between kinetic and potential forms locally within each loop.


  • Therefore, the statement "Energy of the stationary waves travels outwards" is fundamentally false. It describes a progressive wave, not a stationary one.


Why other options are incorrect:

  • Option A is true: The distance between two adjacent nodes equals \( rac{\lambda}{2}\) (half the wavelength).
  • Option B is true: Amplitude varies from zero at nodes to maximum at antinodes.
  • Option C is true: All particles within a single loop (between two adjacent nodes) oscillate in phase.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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