Longitudinal vs Transverse — Sound as a Wave
Sound in air is a longitudinal mechanical wave because medium particles vibrate parallel to the direction in which the wave travels.
Practice This ConceptMain explanation
Teacher explanation
In a longitudinal wave, particles move back and forth in the same line as wave travel, producing compressions and rarefactions. In a transverse wave, particles move perpendicular to the direction of wave travel, producing crests and troughs. Sound needs a medium, so it is also called a mechanical wave.
Example
A slinky pushed and pulled along its length shows longitudinal motion similar to sound in air.
Simple analogy
Longitudinal means along the line of travel.
Common confusion
Students often draw crests and troughs for sound in air without explaining compressions and rarefactions.
Exam tip
When asked why sound is longitudinal, compare particle vibration direction with wave travel direction.
Study the longitudinal vs transverse — sound as a wave diagram carefully
Use the labelled diagram to keep longitudinal vs transverse — sound as a wave clear in short answers and revision.
What this diagram makes clear
This diagram keeps the labels and direction of longitudinal vs transverse — sound as a wave in the right order.
Where this helps in exams
Use this for labelled diagram work and short exam answers on longitudinal vs transverse — sound as a wave.
Revision cue
Revise longitudinal vs transverse — sound as a wave through the labels before writing the answer.
Answer writing and exam use
1-mark use
Write the exact meaning of longitudinal vs transverse — sound as a wave in one clean line.
2-mark use
Define longitudinal vs transverse — sound as a wave and add one example or condition.
3-mark use
Explain longitudinal vs transverse — sound as a wave, show the method or example, and mention the common mistake.
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