Chapter 2 Flashcards
What does sound require for propagation that light and radiant heat do not?
A medium
When a fan is turned on in a closed room, the pressure at the front of the fan is ____ than the pressure at the back of the fan.
higher
An airplane flying faster than the speed of sound is an example of what type of speed?
Supersonic
An elephant can hear this low pitched sound but you can’t, so it’s _____ to you.
infrasonic
An airplane flying at exactly the speed of sound.
Mach 1
What should you look for when reading a graph?
The number of variables present and what each axis represents
In a vacuum there can be no sound (T or F)
True
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
Assume that the speed of sound is 343 m/s. If a rocket is flying in this environment, and its 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 (or hz).
20
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
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. (T or F)
True
Which type(s) of wave motion is present in the human auditory system?
Longitudinal and transverse
Assume that the speed sound is 343 m/s. If you were flying in a hypersonic plane at a speed of Mach 3, what would be your speed in meters per second (m/s)?
1,029
The speed that you would to walk to the cambus is what?
Subsonic
