Properties of Sound
What is the range in hertz that a human can hear?
20 - 20,000
What kind of wave is a sound wave?
(transverse or longitudinal)
longitudinal
The ear is divided into how many parts?
3: Outer, Middle, Inner
The eardrum does what when hit with sound?
starts to vibrate
What makes sense of the sounds we hear?
our brain!
True or False
Waves transfer/move matter.
False
They move energy--think the ping pong ball in the wave machine
What is frequency?
The number of waves that pass a given point in a certain amount of time.
Why is ear wax important?
It helps keep unwanted things out of our ears. It keeps our middle ear safe.
What are the 2 parts of the outer ear?
Pinna and ear canal
What is a regular pattern of motion created by vibration called?
a wave
What is it called when waves bounce off an object and change their direction of travel?
echo
What is the measurement unit for loudness?
decibel
Name 3 things sound travels through?
Solids, Liquids, Gases
What part of the ear will you find the ossicles?
(outer, middle, or inner)
middle
Explain how sound travels into our ears?
The sound waves go through the ___________, down the _________, and then cause the __________ to vibrate.
Pinna, ear canal, eardrum
More waves will give you a higher or lower pitch?
(think of the raining tacos video...what happened to the voice?)
higher
What is amplitude?
the height of the wave
High frequency waves have _________ wavelengths.
Short wavelengths
What part of the ear is responsible for helping us balance?
the semicircular canals
Name 3 characteristics about waves
wavelength (how long or short a wave is)
frequency (how many times a wave passes a set point)
amplitude (how high or loud the wave is)
wavelength
What causes waves to form?
Waves form when something starts to vibrate.
What is the sound called when a plane travels faster than the speed of sound?
Sonic boom!
The Eustachian Tube helps maintain what in your ear?
Air pressure
What is the name of the device that scientists use to study waves?
oscilloscopes