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7/30/2019 b Tuesday Science Form 1b1,2.ppt
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Week: 29
Book: Science 1,
Scott Foresman
Materials: pictures
Period: 10:10-10:55
Date :,, Tuesday
Chapter 9 Lesson 5
How are sounds made?
B1/B2- Science
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SOUNDS GOOD!
Science Form 1b1/2
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Sound travels to your ear
The air vibrates butdoes not travel fromthe alarm to the ear.
Sound
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Large ears to collect sound
Ourears areon the
side ofourheads.
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?
WhydoesMittens
lookunhappy?
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Whales sing
to eachother.
Sound
travelsthroughwater.
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Bush telephone
game
Sound travels throughthe string
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Telephones -- Are like a sound system
The electricalsignal isamplified
A microphonechanges sound to anelectrical signal.
A loudspeakerchanges the electricalsignal to sound.
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Telephones --The message travels
through miles of wires as an
electrical signal.electrical
signal
microphone loudspeaker
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Radio signal
Mobile phones use radioSound - electrical signal - radio signal - electrical signal - sound
In one phone thesound is changed
into an electricalsignal then intoa radio signal.
Sound - electrical signal - radio signal - electrical signal - sound
In the secondphone the radio
signal is changedinto an electricalsignal then intosound.
Mobile
phone
beacons
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What is this?What
sounddoes
shemake?
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What are these?What
sounddo theymake?
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What sound does this make?
How
does itmake the
sound?
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Bells
What
sounds willtheymake?
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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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Size matters!
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What else changes sounds?
How do youtune a violin?
Let us try to
make a stringinstrument.
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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 thesound
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 dependson the length, thickness, and tension.
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Can you spot the baby?
Soundhaslotsofuses
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Ultrasound is very, very high
frequency sound.It is used to see inside people
- to seebabies beforethey are born
if a heart isworking well
blood flow
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Knowledge about sound helps -
Musical instrument designand playing them
Sailors find how deep the water is
Building designso we hear sounds clearly in meetings
so sound does not travel through walls
Sound systems for everyoneradio - CD players
mobile phones - iPods