8L Sound Flashcards
What is the intensity of sound
Whether it is loud or soft
What is the pitch ,of the sound
Whether it is high or low
How are sounds made
By vibrating objects which produce sound waves
How do scientists detect animal sounds
A microphone which is attached to a oscilloscope
What is the amplitude
The height of a sound wave
What is one cycle
One complete wave (up and down )
What is the wavelength
The distance between the same points on two cycles is called the wavelength
A large amplitude gives a
A small amplitude gives a
Loud noise
Quiet noise
A long wavelength means
The frequency is lower and the pitch is lower
A short wavelength means
The frequency is higher and so is the pitch
What is the frequency and what is it measured in
The number of complete waves passing a point each second
Measured in hertz (Hz)
What is the range of frequency for the human ear
20Hz-20 000Hz
What do Sound waves do
Transfer energy
How do sound waves travel
Through a medium in longitudinal waves
Sound waves travel fastest through solids because
The particles are close together which means when they vibrate they will bump into each other more and pass on energy
Can sound waves travel through a vacuum.
No as there are no particles
How do we hear
Sound waves travel through the air and into the auditory canal after the pinnacle directs it , making the eardrum vibrate . This then causes ossicles ( three small bones called the hammer anvil and stirrup ) in the ear to vibrate which causes the liquid inside the cochlea go vibrate , this changes sound waves to signals called impulses which travel to the brain . When it reaches the brain we hear it
What is the cochlea
A spiral structure in the inner ear
What can the human ear be divided into
The inner outer and middle ear
What is in the outer ear
The pinnacle which doeprects sound down the auditory canal to the ear drum
How can the ear get damaged two ways
Loud noises , too high headphones damage the cochlea . No cure
Ear infection which can be treated by antibiotics
As people get olde why do they hear less usually
The hammer anvil and stirrup May fuse together so don’t vibrate
Nerve cells in the cochlea don’t work as well
How I s an echo caused
When a sound wave is reflected . It bounces of the object
How can we measure sound
Using a sound intensity meter units are decibals (dB)
