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Transcript
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 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
