Sound revision powerpoint

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.