Longitudinal waves have vibrations that move ____.

Question

Longitudinal waves have vibrations that move ____.?  
A. at right angles to the direction of the vibrations  
B. in the direction opposite to that of the wave  
C. in the same direction as the wave  
D. in waves and troughs

Accepted Answer

Correct Answer: (C)in the same direction as the wave. 
Rationale: Longitudinal waves feature particle vibrations moving in the same direction as the wave propagation, creating alternating compressions and rarefactions along the travel axis. Sound waves in air exemplify this behavior, air molecules oscillate back-and-forth parallel to the direction sound energy advances.A) at right angles to the direction of the vibrationsThis describes transverse waves (e.g., light, string waves), not longitudinal waves. "Right angles to vibrations" creates logical confusion since it references vibration direction to define itself. Longitudinal waves require parallel, not perpendicular, vibration relative to propagation.B) in the direction opposite to that of the waveParticle vibrations in longitudinal waves oscillate back-and-forth along the propagation axis but don't maintain unidirectional opposition to wave travel. Individual particles move both with and against propagation direction during oscillation cycles. Net particle displacement remains zero while the wave disturbance advances forward.C) in the same direction as the waveLongitudinal wave particles vibrate parallel to the wave's propagation direction, oscillating along the same axis that the wave disturbance travels. Sound waves exemplify this: air molecules compress and rarefy along the direction sound travels, creating pressure variations that propagate energy forward while particles merely oscillate locally.D) in waves and troughsCrests and troughs characterize transverse waves (e.g., water surface waves), not longitudinal waves. Longitudinal waves feature compressions (high density) and rarefactions (low density) instead of elevation-based features. This option misapplies transverse wave terminology to longitudinal phenomena.ConclusionLongitudinal waves exhibit particle vibrations parallel to the direction of wave propagation, creating alternating compressions and rarefactions along the travel axis. Sound waves in air demonstrate this behavior, molecules oscillate back-and-forth along the same line that sound energy advances, distinguishing longitudinal waves from transverse waves with perpendicular vibrations.

Longitudinal waves have vibrations that move ____.

A
at right angles to the direction of the vibrations

B
in the direction opposite to that of the wave

C
in the same direction as the wave

D
in waves and troughs

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Related Questions

Longitudinal waves have vibrations that move ____.

A at right angles to the direction of the vibrations B in the direction opposite to that of the wave C in the same direction as the wave D in waves and troughs

Topic Flashcards

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Related Questions

A
at right angles to the direction of the vibrations

B
in the direction opposite to that of the wave

C
in the same direction as the wave

D
in waves and troughs