Year9Sound Flashcards
Sounds are caused by ..?.. objects
vibrating
Sound waves are ..?.. waves
longitudinal
All waves including sound waves carry ..?..
energy
The part of a sound wave where particles are squeezed closer together than normal is called a …?
compression
The part of a sound wave where particles are farther apart than normal is called a …?
rarefaction
In a longitudinal wave the direction of particle vibration is ..?.. to the direction of wave travel.
parallel
The speed of sound in a liquid is ..?.. than its speed in a gas
higher
The speed of sound in a liquid is ..?.. than its speed in a solid
lower
The equation to calculate speed
speed = distance travelled / time taken
Sound will ..?.. off any hard surface
reflect
When sound reflects it causes an …?
echo
In an echo situation the distance to the reflecting surface equals
1/2 x echo time x speed of sound
Sound cannot travel through a …?
vacuum
Sound will travel ..?.. through any material in which the molecules are closer together.
faster
Sound can only travel if there are ..?.. to vibrate
particles
The speed of sound in air is about …?
330 m/s
The speed of ..?.. is about one million times the speed of sound
light
Sound waves can be displayed using a microphone connected to an …?
oscilloscope
The number of waves created per second or passing a point per second is called the wave …?
frequency
Frequency is measured in …?
Hertz (Hz)
The distance from one compression or rarefaction to the next one in a sound wave is called the …?
wavelength
The unit for wavelength is the …?
metre (m)
The maximum distance moved by each vibrating particle in a sound wave is called the ..?.. of the wave.
amplitude
The unit for amplitude is the …?
metre (m)
On an oscilloscope a wave with a large amplitude will look …?
tall
On an oscilloscope a wave with a large frequency will look …?
narrow
The loudness of a note is controlled by the ..?.. of the sound wave.
amplitude
The note caused by a sound wave with a large amplitude will sound …?
loud
The pitch of a note is controlled by the ..?.. of the sound wave.
frequency
A high-pitched note is caused by a sound wave with a high…?
frequency
A guitar and a trumpet playing the same note sound different because their notes have different …?
quality
The outer part of the ear that funnels the sound waves is called the …?
Pinna
On the way into the ear the sound waves travel along the …?
ear canal
The flap of skin across the end of the ear canal is called the …?
ear drum
Sound waves make the ear drum …?
vibrate
The set of bones behind the ear drum is called the …?
ossicles
When the ear drum vibrates it makes the ossicles …?
vibrate
The ossicles ..?.. the vibrations and pass them on.
amplify
The ossicle connected to the eardrum is called the …?
hammer
The ossicle connected to the oval window is called the …?
stirrup
The oval window is in the side of the …?
Cochlea
The ossicles make the ..?.. vibrate
Oval window
The area of the oval window is ..?.. than the area of the ear drum
smaller
The ..?.. is shaped like a snail’s shell
Cochlea
The Cochlea is filled with …?
liquid
When the oval window vibrates it causes ..?.. in the liquid in the Cochlea
vibrations
The Cochlea is lined with …?
nerve cells
The vibrations in the Cochlear fluid cause the nerve cells to create an electrical …?
signal
The signal from the nerve cells in the Cochlea is sent to the …?
brain
The signals are carried from the Cochlea to the brain along the …?
auditory nerve
The brain interprets the nerve signals from the ear as …?
sounds
A hearing problem that involves a ringing in the ear and that is caused by regular exposure to loud noises is called …?
Tinnitus
Poor hearing caused by old age is due to limited movement of the …?
ossicles
Noise is ..?.. sound.
unwanted
A sudden very loud noise can cause a …?
perforated ear drum
Regular exposure to high volume noise can cause …?
deafness
People working in environments where the noise levels are high should wear …?
ear protectors
The loudness of a sound is measured using a …?
sound-level meter
The unit for measuring loudness is the …?
decibel (dB)
