Sound Waves
This is the top of a sound wave where the density is high.
crest
How does amplitude affect sound?
The higher the amplitude the louder the sound.
What is the threshold of hearing?
the quietest sound people can hear
What produces infrasonic sound?
volcanoes, earthquakes, animals
What are the three main regions of the ear?
inner ear, middle ear, outer ear
This is the amount of energy/power in a sound wave.
intensity
How does frequency affect sound?
Higher frequency creates higher pitch, lower frequency creates lower pitch.
How does the range of frequencies that can be heard change with age?
The ability to hear frequencies as high can be lost over time.
How is sound produced?
Sound resonates in the sinuses.
This is the bottom of a sound wave where the density is low.
trough
What is the quality of a sound?
the unique sound that something makes (ex. instruments)
When a siren moves past you, what is the pitch of the sound?
low
How does temperature affect how sound travels?
Sound moves faster through hot air.
What does the middle ear do?
amplifies sound
What is frequency?
This is the number of oscillations in a given time.
What is pitch?
how high or low a sound is perceived to be
What is the threshold of pain?
The decibel level where sound causes pain
How does the amount of air moving over vocal chords affect sound?
More air produces a louder sound.
What does the larynx do?
supports vocal chords, sound originates here
This is amplitude?
the height of a wave
When a siren is approaching you, what is the pitch of the sound?
high
What type of sound is below the frequency that humans can hear?
infrasonic
How does the state of matter affect how fast sound travels?
Sound moves fastest in solids.
What do the vocal chords do?
vibrate when air passes over them, which creates sound