b Tuesday Science Form 1b1,2.ppt

7/30/2019 b Tuesday Science Form 1b1,2.ppt

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1

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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5

?

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

Documents

b Tuesday Science Form 1b1,2.ppt