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
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 …………………………..………………………………………………….………………………………………………….
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
Sound waves
speaker cone
vibrates.
Sound waves spread like ripples on
a pond.
Airmolecule
Sound waves
Sound waves
Sound waves
If you listen carefully you might.Explain how!
Can you hear a space craft explode in space or on the moon?
Explain!
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.
Mechanical waves
electromagnetic waves
electromagnetic waves
Mechanical waves
electromagnetic waves
Mechanical waves
Mechanical waves
electromagnetic waves
Reflecting sound
Echoes
Hard, flat surface
Soft, absorbing surface
Uneven surface
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