Sound Of Silence Flashcards
What form of wave is sound carried by?
Compression Wave (Longitudinal)
How is sound created?
Vibrations
The Louder the sound, The bigger the____
Amplitude
Vibrations per second is called____
Frequency
What is the unit for Frequency?
Hertz (Hz)
Pitch is determined by____
Frequency
High Pitch, High Frequency =
Short Wave Length
Low Pitch, Low Frequency =
Long Wave Length
Sound Energy is carried by compression waves and so relies on the ______________ in a medium
Collision of neighbouring Particles
If Particles are more tightly packed (Solids or Liquids)_________
Sound waves travel faster
Because particles have less distance to travel to collide
Why does sound travel faster in warm air?
Particles in Oxygen and Nitrogen have more kinetic energy and move quicker.
List all 10 structures within the ear
- Semicircular Canals
- Middle ear
- Auricle
- Outer Ear
- Ear (auditory) canal
- Inner Ear
- Auditory Nerve
- Eustachian tube
- Eardrum
- Cochlea
Semicircular Canals
These 3 tubes control your sense of balance and tell you whether you are up, down or on your side
Middle Ear
Contains the Ossicles (3 smallest bones in the body), These amplify vibrations from the ear drum
Auricle
Outside part of the ear
Outer Ear
Collects the energy from the vibrating air and funnels it along to the eardrum, making it vibrate
Inner Ear
Contains the Cochlea, turns vibrations into electrical energy and sends them to the brain
Cochlea
Lined with millions of tiny hairs, each connected to a nerve receptor, when fluid in inner ear vibrates, hairs move and receptors change the vibration into electrical energy.
Auditory Nerve
Small nerves from receptors in Cochlea merge to for this large nerve that sends signals to the brain
Eustachain tube
This tube joins the middle ear to the nose and throat. When air pressure on the eardrum is not even on both sides the tubes open to balance the pressure
Ear Drum
Pressure from sound waves make the eardrum vibrate
How is sound used in Industry?
Ultra sound is used to produce images of under water (sound is reflected back off of surfaces), same concept applies to unborn babies
How is sound utilised by animals
Dolphins send out high frequency sounds that are reflected back when they hit a target, indicating size and shape
Ultrasound
Sounds that have a frequency that humans cannot hear
