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acoustics homework 1

Terms in this set (25)

What does sound require for propagation that light and radiant heat to not?
a medium
when a fan is turned on in a closed room, the pressure at the front of the fan is (higher/lower), relative to the pressure at the back of the fan
higher
an airplane flying faster than the speed of sound (supersonic,infrasonic, subsonic, Mach 1)
supersonic
an elephant can hear this low pitched sound but you can't, so it's (supersonic, infrasonic, subsonic, Mach 1) to you.
infrasonic
the speed you travel on your bicycle (supersonic, infrasonic, subsonic, Mach 1)
subsonic
an airplane flying at exactly the speed of sound (supersonic, infrasonic, subsonic, Mach 1)
Mach 1
what should you look for when reading a graph?
number of variables present and what each axis represents
where is the x-axis located?
bottom of graph
where is the y-axis located?
on the side of the graph
in a vacuum, there can be no sound (true/false)?
true
sound can propagate through gas, liquid or solid matter. the speed of sound is different in each. slowest, middle, and fastest rank gas, solid, and liquid
slowest- gas
middle- liquid
fastest- solid
the speed of sound in air at a temperature of 10 degrees Celsius is _____ than the speed of sound in air at a temperature of 20 degrees Celsius (less than, greater than, the same as)
less than
assume the speed of sound is 343m/s. if a rocket is flying in this environment, and the speed is Mach 2, what is it's speed in m/s?
686
humans can perceive very low-frequency vibrations, but the lowest frequency that humans can perceive as sound is ___ cycles per second
20
point of maximum speed would be at what point in a graph?
middle of the decline
point of minimum speed would be at what point in a graph?
top/bottom peaks
one sinusoidal cycle is?
the hump up and down
waveform frequency equation:
cycles/second
in a longitudinal wave, particle displacement is ___ to the direction of wave propagation. in a transverse wave, particle displacement is ____ to the direction of wave propagation
parallel, perpendicular
condensation means particles are ___
tightly condensed together (positive on a graph)
rarefaction means particles are___
further apart (negative on a graph)
zero pressure on a graph would show ___?
unsure if particles are apart or together
if you were asked to make a graph showing amplitude as a function of time, you should put amplitude on the ___ axis because it is the ___ variable
y, dependent
the medium through which the sound wave travels experiences local oscillations as the wave passes, but the particles in the medium do NOT travel with the wave (true/false)
true!
which type of wave motion is present in the human auditory system
longitudinal and transverse
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