Booklet 2 Flashcards
How is sound made
When an object vibrates
Sound travels in waves. Explain more about how sound travels
Travel in longitudinal waves this means that the direction of vibrations is the same direction as the movement of the wave.
When do Rare fractions and compressions occur
Sound travels through air as a series of compressions and rare fractions. Compressions occur when particles are closest. Rare fractions occur when particles are furthest apart.
Sound travels fastest in…
Sound waves require particles to transmit them. Sound travels fastest in solids, slowest in gases and not in a vacuum
What are the properties of the ear and where it’s from
The ear is part of the auditory system. It collects and passes sound waves into our body. It converts them into electric signals. Electrical signals are carried to our brain via nerves
What is the outer ear made up of?
The outer ear is made up of the
Pinna
Ear canal
Ear drum
What is the outer ears functions?
Is to collect and channel sound waves. Keep the cannal clean. There are ear wax but it can be a problem if it builds up and that will block it up and the sound won’t go through.
The middle ear is made up of
Bones called the
Hammer
Anvil
Stirrup
And the Eustachian tube
What is the middle ears functions
To amplify the sound waves through the bones vibrating. The eustachian tube is to equalise the pressure in the ear.
The inner ear
Vibrations go to the cochlea beyond the oval window. Fluid and hair cells are in cochlea.
Fibers in the cochlea covey sound informations from the hair cells to the brain as electric signals in the optic nerves.
What is the calculation for speed
Speed =distance/time
Why is the hearing rage for humans
The average hearing rate for a healthy your person is 20hz to 20,000hz. Sound bellow this are called infrasound and sound above this frequency rage are called ultrasound
If a sound is quieter (peak trough”
If a sound is quieter the peak and trough are lower. (Amplitude)
If a sound is high pitch or low pitch the wavelength is
The wavelength is smaller for high or bigger for low
Sound …. In a vacuum
Cannot travel in a vacuum as there is no particles to vibrate
