Q1
Sound cannot travel through a:
Avacuum
Bsolid
Cliquid
Dgas
CBSEClass 9 (CBSE)ScienceCh 11 · Topic 1
Production and Propagation of Sound
Learning how sound is produced and travels as a wave through a medium.
Core concept
Sound waves are longitudinal, meaning particles vibrate parallel to the direction the wave travels, creating alternating regions of compression (particles close together) and rarefaction (particles spread apart). The speed of sound varies by medium: it travels fastest through solids (particles closely packed, transmitting vibrations quickly), slower through liquids, and slowest through gases like air — for example, sound travels roughly four times faster in water than in air.
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• Sound is produced by vibration and travels as a longitudinal wave through a medium.
• Sound cannot travel through a vacuum, since it needs particles to propagate.
• Sound waves create alternating compressions and rarefactions in the medium.
• Sound travels fastest in solids, slower in liquids, slowest in gases.