Transcript Do now! - MrSimonPorter

Last lesson
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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
YouTube - acland's
anatomy 1
YouTube - Science of
Sound
The ear
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 brainmap the page or design a poster
describing causes of hearing loss.
ADVANCE
WARNING
Test on 5th
October