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Difficulty: HardProduction, Propagation, and Classification of Waves

Match each physical wave propagation scenario on the left with its correct classification and particle vibration characteristics on the right.

  • Disturbance generated by an oscillating electric charge propagating through a vacuumNon-mechanical wave; field vectors oscillate perpendicular to the direction of energy propagation
  • Pressure pulse propagating through a pressurized cylinder containing argon gasMechanical wave; medium particles oscillate strictly parallel to the direction of wave propagation
  • Shear displacement pulse traveling along a taut, stretched guitar stringMechanical wave; medium particles oscillate strictly perpendicular to the direction of wave propagation
  • Water ripple propagating across the interface between air and deep waterMechanical surface wave; particles execute combined longitudinal and transverse circular motion

Answer

Oscillating electric charge in a vacuum matches non-mechanical wave with perpendicular field oscillations; pressure pulse in argon gas matches mechanical longitudinal wave with parallel oscillations; shear pulse on a stretched string matches mechanical transverse wave with perpendicular particle oscillations; water ripple on deep water matches mechanical surface wave with combined circular motion.
The correct pairings align each physical wave scenario with its underlying propagation mechanics. The oscillating charge producing field variations in a vacuum represents a non-mechanical transverse electromagnetic wave. The pressure disturbance in argon represents a longitudinal mechanical wave because fluids transmit energy through density compressions. The pulse on a stretched string is a transverse mechanical wave enabled by string tension. Surface water ripples are two-dimensional interface waves exhibiting combined longitudinal and transverse particle movement.

Step-by-Step Solution

1
Classify the disturbance in a vacuum (oscillating charge).
Identified as electromagnetic radiation, which is non-mechanical and transverse.
Electromagnetic waves do not require a material medium and involve mutually perpendicular field vectors perpendicular to propagation.
2
Analyze wave propagation through a gaseous medium (argon gas).
Identified as a purely longitudinal mechanical wave.
Gases lack shear strength and can only transmit mechanical energy through volume variations (compressions and rarefactions) parallel to the propagation vector.
3
Evaluate wave propagation along a stretched 1D solid string.
Identified as a transverse mechanical wave.
Tension in the solid string restores lateral shear displacements, causing medium elements to vibrate perpendicular to the string length.
4
Determine the nature of surface waves on liquid interfaces.
Identified as a mechanical surface wave with orbital motion.
Interface boundaries support gravity and surface tension restoring forces, producing elliptical/circular particle trajectories combining transverse and longitudinal components.

Key Concept

Classification of waves by medium requirement (mechanical vs. electromagnetic) and directional displacement mode (transverse, longitudinal, and surface orbital motion).
Estimated Time:2m 0s
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Topics

Production, Propagation, and Classification of Waves

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