sound revision powerpoint
DESCRIPTION
This powerpoint is useful for revision at the end of the sound topic.TRANSCRIPT
SOUNDBy Chloelovesjls
MEANINGS
340M/S
This is the speed of sound in the air
AMPLITUDE
The length from the crest/ through to the change in state
Crest
Trough
WAVE LENGTH
From one point to another similar point
DECIBELS
The measurement of the loudness of sound
dB
COMPRESSION
Closer together sound wave, higher pressure
Compressions
RAREFRACTION
Further apart sound waves, low pressure
Rarefractions
FREQUENCY
Pitch of sound
OSCILLOSCOPE
Hardware that measures the pitch/frequency
20KHZ The highest pitch a human can hear on average
20KHz
OVERTONES
Noises that different animals/people can recognise
1500M/S
This is the speed of sound in water
OSCILLATION
Is the movement of backwards and forwards
(can’t find a picture, sorry )
PERIOD OF WAVE
How long a wave takes to repeat itself
LONGITUDINAL WAVES
Particles vibrate in the same direction as the energy
TRANSVERSE WAVES
Particles vibrate perpendicular to the direction that the energy travels
HERE ARE A FEW FACTS 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
HOW WE HEAR 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.