Fundamentals of sound
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Transcript of Fundamentals of sound
Fundamentals of Sound
From musical boxes to iPods
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Sound travels to your ear
The air vibrates but does not travel from the alarm to the ear.
Sound
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Whales sing to each other.
Sound travels through water.
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Telephones -- Are like a sound system
The electrical signal is amplified
A microphone changes sound to an electrical signal.
A loudspeaker changes the electrical signal to sound.
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Telephones -- The message travels through miles of
wires as an electrical signal.
microphone
loudspeaker
electrical signal
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Radio signal
Mobile phones use radio
Sound - electrical signal - radio signal - electrical signal - sound In one phone the sound is changed into an electrical signal then into a radio signal.
Sound - electrical signal - radio signal - electrical signal - sound
In the second phone the radio signal is changed into an electrical signal then into sound.
Mobile phone beacons
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What is this?
What sound does she make?
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What are these?
What sound do they make?
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What sound does this make?
How does it make the sound?
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Bells
What sounds will they make?
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Size matters!
Large things make
___________ sounds
Small things make
___________ sounds
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New words:
High pitch = high frequency
Low pitch = low frequency
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What have we learned? Vibrating objects make sounds
Sound needs a medium through which to travel – air, water, string - - -
The medium vibrates but does not travel with the sound
Large vibrations make loud sounds- small vibrations make quiet sounds
Large objects make low frequency sounds- small objects make high frequency sounds
In strings the frequency of the sound depends on the length, thickness, and tension.
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Can you spot the baby?
Sound has lots of uses
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Ultrasound is very, very high frequency sound.
It is used to see inside people - to see
babies before they are born
if a heart is working well
blood flow