How Sound Waves Travel
CONCEPTUALExplain that sound is produced by vibrating objects and travels as a longitudinal pressure wave through solids, liquids, and gases; describe reflection of sound (echoes) and absorption; explain why sound cannot travel through a vacuum
Mastery Evidence
- Explains how a vibrating object creates regions of compression and rarefaction in air
- Explains why sound travels fastest in solids and cannot travel in a vacuum
- Describes how an echo is produced and gives a practical application (sonar, ultrasound)
- Explains what sound absorption means and why soft furnishings reduce echoes
Assessment Prompt
“If [child] heard an echo in a large empty hall, could they explain what causes the echo, why the same sound in a carpeted living room doesn’t echo, and what would happen to sound in outer space?”
Curriculum Standards1 alignment
KS3.Sci.Phys.Waves.3The national curriculum in Englandsound produced by vibrations and transmitted as a pressure wave through a solid, liquid or gas; pressure wave; echoes, reflection and absorption of sound
Prerequisites2
- Wave Properties & TypeshardAges 11—12
- Sound Travels Through MaterialshardAges 8—9
Show full prerequisite tree
- Wave Properties & Types hard
Describing sound as a longitudinal pressure wave requires the general wave properties framework
- Waves & How They Move hard
Wave properties and the wave equation build directly on the wave model (amplitude, wavelength, frequency) introduced in upper KS2/early secondary
- Light & Sound Vocabulary hard
Understanding vibrating materials and sound requires 'vibration' vocabulary
- Communication with Light & Sound hard
Must understand how sound works before designing a communication device using it
- Light & Seeing in the Dark hard
Must understand how light works before designing a communication device using it
- Light & Sound Vocabulary hard
Observing that objects need illumination to be seen requires the 'light source' vocabulary
- Light & Sound Vocabulary hard
Finding patterns in volume requires 'volume' and 'vibration' vocabulary
- Wave Behaviour Vocabulary hard
Developing a wave model using amplitude and wavelength requires this technical vocabulary
- Sound Travels Through Materials hard
Must understand sound travels through media before modelling wave properties
- Vibrations & Sound hard
Must know sound comes from vibrations before learning vibrations travel through media
- Light & Sound Vocabulary hard
Understanding vibrating materials and sound requires 'vibration' vocabulary
- Communication with Light & Sound hard
Must understand how sound works before designing a communication device using it
- Light & Seeing in the Dark hard
Must understand how light works before designing a communication device using it
- Light & Sound Vocabulary hard
Observing that objects need illumination to be seen requires the 'light source' vocabulary
- Light & Sound Vocabulary hard
Describing vibrations travelling through a medium requires vibration vocabulary
- Wave Behaviour Vocabulary hard
Describing waves in terms of amplitude, wavelength, and frequency requires these exact terms
- Vibrations & Sound soft
Vibrating materials producing sound is a concrete anchor for understanding wave motion
- Light & Sound Vocabulary hard
Understanding vibrating materials and sound requires 'vibration' vocabulary
- Communication with Light & Sound hard
Must understand how sound works before designing a communication device using it
- Light & Seeing in the Dark hard
Must understand how light works before designing a communication device using it
- Light & Sound Vocabulary hard
Observing that objects need illumination to be seen requires the 'light source' vocabulary
- Sound Travels Through Materials hard
Sound as a pressure wave extends the understanding that vibrations travel through media
- Vibrations & Sound hard
Must know sound comes from vibrations before learning vibrations travel through media
- Light & Sound Vocabulary hard
Understanding vibrating materials and sound requires 'vibration' vocabulary
- Communication with Light & Sound hard
Must understand how sound works before designing a communication device using it
- Light & Seeing in the Dark hard
Must understand how light works before designing a communication device using it
- Light & Sound Vocabulary hard
Observing that objects need illumination to be seen requires the 'light source' vocabulary
- Light & Sound Vocabulary hard
Describing vibrations travelling through a medium requires vibration vocabulary
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