2. Last lesson Learning to listen Sound as vibrations Amplitude and volume Frequency and Pitch Range of human hearing

3. Amplitude = volume

4. Pitch = frequency

5. Range of hearing Humans can hear up to a frequency of around 20 000 Hz (20 kHz)

6. Today’s lesson The ear The decibel scale Hearing loss

7. The ear YouTube - acland's anatomy 1 YouTube - Science of Sound

8. Can you gather around Mr Porter please?

9. Mr Porter has a sheet for you to do

10. 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/I o ) where I o = 1 x 10 -12 W.m -2.

11. Decibel scale

14. 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 5 th October