Off Pitch
Vocab
Elephant Ears
Ear Parts
Wavy Sounds
100
How does sound energy travel?
in waves
100
What is a long, drawn-out sound caused by a collection of echoes?
reverberation
100
What does the ear canal make in order to prevent infection?
earwax
100
What is the tunnel that leads from the outer ear to the eardrum?
ear canal
100
What do sound waves form when they hit a hard, smooth object?
echo
200
What does the pitch of a sound depend on?
the frequency
200
What is the most common unit to measure loudness?
decibel
200
What does the middle ear prevent the sound waves from becoming?
too faint
200
What is the membrane between the outer ear and middle ear that vibrates when sound waves hit it?
eardrum
200
What happens to sound when sound waves are spread out?
they become quieter/softer
300
What is the threshold of hearing?
the softest sound people can hear
300
What is how high or low a sound is?
pitch
300
What part of the cochlea turn the vibrations into nerve messages?
the tiny hairs
300
What sends messages about sounds to the brain?
auditory nerve
300
Explain why thunder has a low frequency.
because fewer than 50 sound waves strike your ear each second
400
Sounds at 120 decibels have so much energy that they can cause what?
pain to your ears
400
What is the bending of a wave as it moves from one material to another?
refraction
400
List the 3 bones of the middle ear.
hammer, anvil, and stirrup
400
What is the middle bone in the series of three small bones in the middle ear?
Anvil
400
What happens to sound waves when they are diffracted?
Some are reflected and some are absorbed
500
Why can sound waves NOT travel through empty space?
because they need material in order to vibrate
500
What is the bending of a wave around an object?
diffraction
500
List the 3 main sections of the ear.
Outer, middle, and inner
500
What is the spiral-shaped structure in the inner ear that turns vibrations into nerve messages?
Cochlea
500
When sound waves reach an object, they can either be:
reflected transmitted absorbed diffracted refracted
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