Measurements
The definition of Hertz (Hz)
Waves of the same frequency and matching amplitude direction.
Constructive Interference
Required for any mechanical wave.
A medium
Energy moving through a medium
This tight membrane vibrates in response to differences in air pressure.
Ear Drum
If the frequency is decreasing, then what must the wavelength be doing?
Increasing
Waves of the same frequency and opposing amplitude directions
Destructive Interference
The range of frequencies that the human ear can register.
20 Hz - 20,000 Hz (children)
50 Hz - 15,000 Hz (Adults/Elderly)
The number of waves produced every second.
Frequency
The nerve responsible for communicating sound and balance information to the brain.
Vestibular Nerve
The severity of the difference between these determines the volume.
Alternating regions of high/low pressure.
Used by noise canceling headphones.
Destructive Interference
Positive amplitude corresponds to this physical quantity.
Higher Air Pressure
The unit of frequency.
Hertz (Hz)
The number of axis of motion that the semicircular canals measure.
3 (three)
The unit of "loudness"
Decibel
Used by concert venues when considering speaker placement.
Constructive Interference
The state of matter through which the speed of sound is the greatest.
Solid
The difference between wave resting position and its maximum height
Amplitude
The fragile and precise bones within the ear.
Ossicles (Malleus, Incus, Stapes)
The frequency of a sound made by 18 wavelengths produced over 2 seconds.
9 Hz
This property strongly influences the speed of sound through a material.
Density
The distance between corresponding regions of air pressure.
Wavelength
The antenna and fluid filled organ that interprets vibration as a sound impulse to the brain.
Cochlea