This powerpoint is useful for revision at the end of the sound topic.

1. By Chloelovesjls

3. Thisis the speed of sound
in the air

4. The length from the
crest/ through to the
change in state
Crest
Trough

5. From one point to another
similar point

6. Themeasurement of the
loudness of sound
dB

7. Closertogether sound
wave, higher pressure
Compressions

8. Furtherapart sound
waves, low pressure
Rarefractions

9. Pitch of sound

10. Hardware that measures
the pitch/frequency

11. Thehighest pitch a human
can hear on average
20KHz

12. Noisesthat different
animals/people can
recognise

13. Thisis the speed of sound
in water

14. Isthe movement of
backwards and forwards
(can’t find a picture, sorry )

15. How long a wave takes to
repeat itself

16. Particlesvibrate in the
same direction as the
energy

17. Particles vibrate
perpendicular to the
direction that the energy
travels

18.  Sound travels faster in higher temperatures
 In a vacuum sound waves cannot travel
because there are no particles to carry them
 Sound waves are produced in musical
instruments and voices by objects and air
vibrations
 Things that vibrate make sounds

19.  The pinna (the large flap of ear we can see)
collects the sound waves and then these pass
through the ear canal until they reach the ear
drum. The ear drum vibrates and pass the sound
waves into the middle ear. This meets three
small bones called the ossicles that transmit
sound very efficiently. The vibrations from these
bones are passed through the fluid in the
cochlea and make tiny hairs move. When the
hairs move they cause an electrical signal to
travel through the auditory nerve and send a
message to the brain. Your brain makes sense of
the signal and you can hear the sound.