A region of high molecular density and high air pressure is called a _____________________.
compression
rarefaction
vibration
wave
Sound waves are ________________.
longitudinal
transverse
sine waves
electromagnetic waves
Frequency is defined as what?
The number of cycles per unit of time
The amount of time per cycle.
The same as velocity.
The distance between cycles of a wave.
With sound, frequency determines _______________.
pitch
color
loudness
intensity
Sound waves can travel through which of the following? (Select ALL that apply)
Solids
Liquids
Gases
Empty space
The speed of down depends on both the ___________ and ____________ of the medium.
type, temperature
type, harmonics
temperature, harmonics
harmonics, velocity
Sound waves can be approximated as __________.
spherical
conical
cubic
As the source of a sound approaches you, the pitch of the sound seems to ___________.
be higher
be lower
remain the same
Because of the Doppler Effect, when a sound source is moving away from you, the frequency seems to ____________ although it actually ____________.
lessen, remains the same
become greater, remains the same
remain the same, lessens
remain the same, becomes greater
As a soundboard vibrates back and forth, its _________ is converted into sound waves.
kinetic energy
potential energy
harmonics
Intensity is the rate of _________ through a given area.
energy flow
speed
frequency
__________ and __________ determine which sounds are audible.
Intensity, frequency
Intensity, decibels
Frequency, velocity
Velocity, decibles
The unit for the decibel is __________.
(none)
dB
db
W/m^2
Sympathetic vibrations occur when _______.
vibrations are transferred from one object to another
an object vibrates at its natural frequency
a vibration is amplified
Vibration at the natural frequency produces _____________.
resonance
the Doppler Effect
compressions
In 1940, a bridge collapsed due to an issue with ___________.
resonanace
impulses
