science form 2-chapter 1

1. 1.5) Sense of Hearing &
Sound

2. Parts of Human Ear

3. (i) outer part
a) Pinna:

4. b) Auditory canal/ear canal

5. c) Ear Drum

6. (ii) Middle Ear
-Ear Bones or Ossicles
Amplify sound vibrations
ampl

7. -Oval Window
(send vibration to the inner ear, make the
fluid in cochlea vibrates)

8. E
-Eustachian tube

9. iii) Inner Ear
-cochlea

10. -detects vibrations
-convert vibrations into nerve impulse

11. -Auditory nerve
(send the nerve impulses to the brain
for interpretations)

12. The hearing Mechanism???
How do we hear?
(refer to cd courseware)

13. Sound and hearing
1.How is sound produced?
-sound is produced by ………………
2. Whenever an objects vibrates, its kinetic energy is
changed into ………………energy
Kinetic energy
(sc.pract pg 27)

14. Transmission of sound
-sound travel through a medium
-sound travel through:
i) solids
ii)liquids
iii) gases
-sound travels very fast through solid
and slowest through gas. WHY???

15. (particles in solid is very compact, sound
vibrations can pass very quickly form
particles to particles)
-sound cannot travel through VACUUM
-Ex:1) loud explosions which takes
place in the Sun cannot be heard on the
earth,WHY???
(there is a large vacuum between the
sun and the earth)