Welcome back! To start us off produce a title page for SOUND!For keywords use go science book 2

What do we know about sound?Around the room there are information sheets to help you

‘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

The Ear – Partner A

The Ear – Partner A

A’s back to the board

Take the picture

B’s ready to describe

Ready to swap...

The Ear – Partner B now

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...

http://www.youtube.com/watch?v=wgKpWxTIJas

How do we hear?

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

The Ear

Storyboard

Produce a storyboard of how we hear

Include diagrams AND descriptions

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

Was this what you expected?

Where do you think a vuvuzela would come?

A vuvuzela measures

about 130db!

http://www.youtube.com/watch?v=_DKoXIyLWds&feature=related

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