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Vibrations, sounds and their effects (Defintions (Tuning fork - a metal…
Vibrations, sounds and their effects
Sounds = vibrations that we can hear
How do we hear sound
The sound waves passes through the ear
The outer ear catches the sound waves
The sound waves travel along the ear canal
Vibrations travel through the ear-drum
Vibration travel through tiny bones in the inner ear
The sound waves hit the inner ear and make it vibrate
A nerve takes the sound to the brain which makes sense of the sound
Sound trvel
Air
Water
plastic
Metal
Wood
All sounds are made when something vibrates
Making sounds
Volume = how loud or soft a sound is
More energy increases vibrations (sound) increases the volume
Pitch = a measure of how high or low a sound is
High Sounds
Fast Vibrations e.g. whistle or a squeak
Tight strings
Short Tube
Low sounds
Slow vibrations make low deep sounds like thunder or a dog growling
Loose strings
Long tube
Noise pollution
Audiologist
Audiologist = A person who tests hearing and fits hearing aids for people who are hearing-impaired
Hearing aid = small machine that fits behind the ear or inside the ear and makes sounds louder
Loud, harmful and unpleasant sounds for a long time
dB - decibels
more than 85dB - a lot of the time hearing will get worse
more than 130dB hearing loss straight away
Vibrations move out in all directions
Our ears hear the vibrations
Our bodies feel thevibrations
Defintions
Tuning fork - a metal object with two long arms. When you tap it it produces a musical note
Sound Wave: the way that sound travels through the ear
ear canal: A tube that connects the outside of your ear to the inside of your ear
eardrum: A thin piece of skin inside your ear that vibrates when sound waves hit it
nerve: a group of long fibres that carries messages from your brain and a part of your body