A Flashcards
(24 cards)
Define compression
An area where particles are bunched close
Define rarefaction
An area where the particles are spread out
Define wavelength
Distance between successive waves
Define frequency
The number of waves that pass a point in one second
What does sound need to travel
Medium- solid liquid or gas
Can sound travel in space / vacuum
No
How does sound travel through mediums
In longitudinal waves
Longitudinal waves
When wave travels to side and so do the particles
Transverse wave
Wave travels to side and particles vibrate up and down
What is used to compare sounds
Cro
Which source produces a higher pitch or frequency
A source which vibrates rapidly
What is frequency measure in
Hertz Hz
Why does sound travel through solids faster
This is because the particles in a solid are packed closer together and the closer particles are in a medium the faster sound waves travel through it- shorter distance between particles
What is loudness measured by
Decibels dB
What does noise destroy in the ear
Sensory sells also known as hair cells
Causes of hearing loss
Constant exposure to noises over 85dB
Ear wax blockage
Raptured eardrum
Water in inner ear
What do hair cells do
Send signals to the brain they cannot be replaces
NIHL
Noise induced hearing loss
Ways to reduce noise in workplace
Replace outdated equipment
Use sound padding for walls and ceiling
Use ear protection
What is the Doppler effect
An increase or decrease in frequency of sound wVes depending on distance of observer. Further the lower the frequency the closer the higher frequency
What is an ultrasound
Sound waves with frequency above human hearing range. When waves pass through fluid and soft tissue to deflect off layer from organ to create an image from the echos of the waves using computer analysis
Frequencies involved with ultrasound
Frequencies higher than 20,000 Hz or 20kHz
Define amplitude
A measure of how far the particle moves from it’s starting position
Define transmit
To move a sound from one place to another
