PHYSICS - 8 CAMBRIDGE

1. 8.6 HEARING SOUNDS
SIR.MUHAMMAD

2. VIII CAMBRIDGE - PHYSICS
We hear sounds when the sound
waves reach our ears
Ears are very sensitive organs
that convert sound energy into
electrical signals that travel
to our brains

3. THE STRUCTURE OF EARS
THE OUTER EAR THE MIDDLE EAR THE INNER EAR
THE EAR PINNA
THE EAR CANAL
THE EAR DRUM
THE OSSICLES THE COCHLEA

4. THE STUCTURE OF EARS & MECHANISM OF HEARING

5. THE OUTER EAR
The pinna : It is shaped so that it collects sound energy
The ear canal : the tube that connects the outer part of the ear
to the middle ear
The ear drum : a thin layer of tissue that separates the outer
parts of the ear from the internal parts . It transmits the sound
onwards and protect the rest of the ear from infection

6. THE MIDDLE EAR
The Ossicles : three small bones work together to pass the
energy of sound waves to the cochlea
THE INNER EAR
The Cochlea : a coiled tube filled with a fluid and tiny hair –
like structures
When the vibrations reach the Cochlea the hairs moved
backwards and forwards.
The hairs in the Cochlea send electrical signals to the brain
along a set of nerves
Our brain interprets these signals as sound

7. REMARKS
The Ears are also important in our sense of balance
Semi-circular canals detect how our head is tilted or if we are
rotating
When we spin a round ,the fluid in these canals spins
PAIRS OF EARS
When you hear a sound you can usually tell which direction
the sound is coming from. This is because humans have a pair
of ears; one on each side of their heads

8. Past Papers
QUESTIONS
FROM 8.1 TO 8.6

9. QUESTION 1

10. QUESTION 2

11. QUESTION 3

12. QUESTION 4

13. QUESTION 5

14. QUESTION 6

15. QUESTION 7

16. QUESTION 8

17. QUESTION 9

18. QUESTION 10

19. THANK YOU
SIR.MUHAMMAD