http://ruletheweb.co.uk/b3ta/bus/NBBKRQTK/DO%20NOW%21%208AB/CAN%20YOU%20READ%20THROUGH%20THE%20SHEET/YOU%20DID%20LAST%20LESSON/bus.jpg?dl

Last lesson

• Learning to listen

• Sound as vibrations

• Amplitude and volume

• Frequency and Pitch

• Range of human hearing

Amplitude = volume

Pitch = frequency

Range of hearing

Humans can hear up to a frequency of around 20 000 Hz (20 kHz)

Today’s lesson

• The ear

• The decibel scale

• Hearing loss

The earYouTube - acland's anatomy 1

YouTube - Science of Sound

Can you gather around Mr Porter

please?

Mr Porter has a sheet for you to do

The decibel scale

The sound intensity level attempts to quantify the sensation of hearing. It relates sounds to the lowest intensity that can normally be heard by a human ear (0.000000000001 W.m-2)

Sound intensity level (dB) = 10log(I/Io)

where Io = 1 x 10-12 W.m-2.

Decibel scale

Decibel scale

Damage to hearing

Can you READ page 147 and either brain-map the page or design a poster describing causes of hearing loss.

ADVANCE WARNING

Test on 5th October