sound waves lesson objectives state that: sound cannot travel through a vacuum but can travel...
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Sound waves
Lesson objectives
state that:sound cannot travel through a vacuum but can travel through solids, liquidsand gases
describe how sounds travel through solids, liquids and gases
explain in terms of the particle model why sound needs a medium.
explain how sound travels at different speeds in different types of material
explain everyday phenomena in terms of the different speeds at which sound travelsin air and solidsKey words:
vibrations , molecules, medium, vacuum, solid, liquid,
gas, longitudinal, wavelength
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Sound waves
Sound can travel through solids, I know this because …………………………..……………………………………………….………………………………………………….
Sound can travel through liquids, I know this because …………………………..………………………………………………….………………………………………………….
Sound can travel through gases, I know this because …………………………..………………………………………………….………………………………………………….
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Sound waves
In a sound wave the molecules vibrate backwards and forwards
CC
C
R R R
Compression;air molecules are squashed together
Rarefaction;air molecules are further apart
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Sound waves
speaker cone
vibrates.
Sound waves spread like ripples on
a pond.
Airmolecule
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Sound waves
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Sound waves
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Sound waves
If you listen carefully you might.Explain how!
Can you hear a space craft explode in space or on the moon?
Explain!
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P 3 2.6 SOUND
For a C grade you should be able to:• State the range of hearing for a typical human.• Describe the properties of a sound wave, including its longitudinal nature.• Describe the behaviour of a sound wave, including reflection and refraction.
For an a grade you should also be able to:• Explain why mechanical vibrations produce sound waves.
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Mechanical waves
electromagnetic waves
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electromagnetic waves
Mechanical waves
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electromagnetic waves
Mechanical waves
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Mechanical waves
electromagnetic waves
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Reflecting sound
Echoes
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Hard, flat surface
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Soft, absorbing surface
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Uneven surface
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