Q1
What type of wave is sound?
ALongitudinal
BTransverse
CNeither type
DBoth types equally
ICSEClass 8 (ICSE)ScienceCh 7 · Topic 1
Sound
Sound is produced by vibrations and travels as waves through a medium, with properties like pitch, loudness, and speed varying by conditions
Core concept
Sound waves are longitudinal waves, meaning particles vibrate in the same direction the wave travels, unlike transverse waves like light.
How it works
The speed of sound varies by medium - fastest in solids, slower in liquids, and slowest in gases like air, since particles are more closely packed in solids.
Why it matters
Noise pollution, caused by excessive or unwanted sound, can harm hearing and cause stress, making sound level control important.
Key detail
Understanding sound properties and behaviour explains musical instruments, hearing, echo formation, and noise control technologies.
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• Sound waves are longitudinal waves.
• Particles vibrate in the wave's direction of travel.
• Sound travels fastest in solids.
• It's slower in liquids and slowest in gases.
• This is due to particle spacing.
• Noise pollution can harm hearing and cause stress.
• Sound level control is important.
• Understanding sound explains instruments and hearing.