Show:
THE EAR:PART 1
THE EAR: PART 2
WAVES
SOUND
MISCELLANEOUS
100
What is contained in the outer ear?
The pinna, ear canal and ear drum.
100
What is contained in the middle ear?
The hammer, anvil and stirrup.
100
What is wavelength?
Wavelength is the distance between one part of a wave and the same part of the next wave
100
How is sound created?
Sound is created by vibrating objects.
100
What is an echo?
An echo is the sound waves that are reflected back.
200
What is the main job of the middle ear?
To amplify sound.
200
What is contained in the inner ear?
The cochlea and the auditory nerve.
200
What is frequency?
Frequency is the number of waves moving past a point in one second
200
What two things affect the pitch of an instrument?
The length and the thickness both affect the pitch of an instrument.
200
What is volume and what is it measured in?
Volume is the amount of sound energy that reaches your ears. It is measured in decibels.
300
What is the job of the pinna?
The pinna is specially shaped to gather, focus and direct sound waves into the ear.
300
What is the job of the hair cells located inside the cochlea?
The hair cells create nerve impulses which go to the brain along the auditory nerve.
300
What is pitch?
Pitch is a measure of how high or low a sound is
300
What is compression?
Compression is the part of a sound wave where air particles are pushed close together.
300
What is pitch measured in and what is the range that humans can hear?
Pitch is measured in hertz. The range is 20 hz - 20,000 khz.
400
What is the cochlea?
The cochlea is a snail shaped tube that is lined with receptors that respond to sound.
400
Where does the stirrup "tap"?
The stirrup taps on the inner ear at a spot called the oval window.
400
What is amplitude?
Amplitude is how much energy a sound wave has.
400
What are the two main differences between how light waves travel and how sound waves travel?
Light waves travel faster than sound waves. Sound waves are able to travel in any and all directions while light waves travel in a straight line.
400
What is noise pollution?
Noise pollution is any sound that causes problems for people or things.
500
Why does a sound decrease in volume as you move further away from the source?
The sound waves lose energy and become weaker.
500
What decibel level would cause hearing loss?
80 decibels.
500
What is sonar?
Sonar is an instrument that uses reflected sound waves to find underwater objects
500
What is an ultrasonic sound?
An ultrasonic sound is too high-pitched for the human ear to hear.
500
What are vocal chords?
Vocal chords are folds of thing muscle tissue in our larynx, or voice box.