Welcome back! To start us off produce a title page for SOUND! For keywords use go science book 2.
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Transcript of Welcome back! To start us off produce a title page for SOUND! For keywords use go science book 2.
‘Ear’ earTo start off our new topic :Answer TRUE or FALSEChallenge: Answer why?
1) If your eardrum breaks you will be deaf forever2) People use their ears in the same way bats do3) Antibiotics can treat some hearing problems4) The ear bones are in the middle of the ear
Objectives:
•Name the parts and positions of the ear (L4)
•Describe how sound is detected by the ear (L5)
•Explain some different types of hearing loss (L6)
‘Ear’ ear
A’s, you will need a piece of a4 scrap paper, a pencil and something to rest on. You need to turn and face the back of the room next to the person you are partnered with.
B’s, you will describe the diagram we are about to look at. You can talk to each other as much as you like about what to draw BUT A’s must not look at the drawing!
After 4 minutes, swap roles to draw the other half of the diagram.
Paired Draw – Shoulder Partners
Put your drawings on your table.
Have one trip around the room.
Look at others.
How does yours compare?
Who’s is the best?
How would you improve yours?
Compare others now...
Face partners, A & B
A to explain to B
The structure of the ear
30 seconds thinking time
1 minute talking time
B to explain to A
How we hear sounds
30 seconds thinking time
1 minute talking time
Tell a friend...
1. Sound waves are collected by the ear lobe or pinna.
2. The waves travel along the ear canal.
3. The waves make the ear drum vibrate.
4. The small bones [ossicles] amplify the vibrations.
5. The cochlea turns the vibrations into electrical signals.
6. The auditory nerve takes the signals to the brain.
The Ear
Ear gets blocked by waxAccidents or loud bangs can damage the eardrumMiddle ear can get infected
Older peoples bones may fuse
Nerve cells in the cochlea degrade with time
Loud noise may damage the cochlea
This can be treated with antibiotics
This might repair itself
This prevents vibration
There is no cure for this
Signals are not sent to the brain
A doctor can wash this out
How might our ears become damaged?
Understanding Checkpoint:
1) If your eardrum breaks you will be deaf forever2) People use their ears in the same way bats do3) Antibiotics can treat some hearing problems4) The ear bones are in the middle of the ear
• Are 2 ears better than 1 for determining the direction of a sound?
• Could you devise an experiment to test this?
When a sound wave hits an object it can _______
The wave bounces off the object and causes an ____
Reflect, Echo
Sound waves that do not get reflected by a material and do not pass through it are said to be ________ by the material
These materials are known as ‘_____ _________’
Absorbed, sound insulators
Unwanted sound is called ‘noise’
Very loud or unpleasant sounds are called ‘noisy’
We use a sound intensity meter to measure how loud a sound is
The loudness is measured in decibels (db)
Threshold of Hearing
The ‘threshold of hearing’ is the quietest sound we can hear
We call this 0db
A road drill is c. 90db
Pain! Sound becomes painful at about 134db (the level at which
Miss Graham shouts?)
The eardrum breaks at 185db
The Decibel Scale……Put them from quietest to loudest
Jet engine at about 100m
Watch ticking
Quiet office
Rustling or falling leaves
Birds flying by
Normal conversation
Vacuum cleaner
Quiet conversation
Busy street traffic
Pneumatic drill
Should the vuvuzela be banned?
Write an argument for or against!
You MUST include scientific theory (what will it do to the ear?)
NOISIEST AND QUIETEST PLACES Noisiest
1 Newcastle - 80.4 decibels2 Birmingham - 79.1 decibels
3 London - 78.5 decibels4 Darlington - 78.3 decibels= Doncaster - 78.3 decibels
Quietest1 Torquay - 60.2 decibels2 Paignton - 65.7 decibels
3 Scunthorpe - 66.4 decibels4 Folkestone - 66.8 decibels5 Colchester - 68.1 decibels