Waves and pulsation
Definitions
Label the picture
Perceptions of sound and music
What happens when...
100
What type of wave is pictured below, transverse or longitidunal?
Longitudinal (compression wave)
100
# of vibrations per second
frequency
100
What is the highest point of a wave called (A) ?
Crest
100
The "pitch" corresponds to what physical property?
Frequency
100
What happens to the pitch when you increase the frequency of a sound wave?
It sounds higher
200
In what direction is energy moving, parallel or perpendicular?
Parallel
200
The distance from one point to the next similar point (such as a crest or trough)
wavelength
200
What is the lowest point of a wave called (D) ?
Trough
200
What unit is used to measure frequency?
Hertz (Hz)
200
What happens when you increase the amplitude of a sound wave?
It gets louder
300
What kind of wave is shown below? Transverse or Longitudinal?
Transverse
300
How fast the wave transfers energy from one place to another
Speed
300
What do you call "B" or "E"?
Wavelength
300
Loudness is measured by what physical property?
Intensity
300
What happens to the amplitude when you you decrease the frequency of a sound wave?
Nothing, it stays the same.
400
What do you call the increase in amplitude of a system's natural frequency when it is exposed to the same, repeated vibrational force?
Resonance
400
The # of seconds required for one complete wave
Period
400
What is "C" ?
Amplitude
400
What unit can be used to measure loudness or intensity?
Decibels (dB) or Watts / meter2
400
What happens to the wavelength when you you decrease the frequency of a sound wave?
It gets longer
500
What is the natural frequency of the Earth called, which pulsates at 7.83 Hz?
Schumann Resonance
500
The maximum distance (or height) a wave moves from its equilibrium position
amplitude
500
What is the horizontal line that "C" or "E" is measured from?
Equilibrium
500
What is the musical word also known as tone quality?
Timbre
500
What happens to the sound energy (intensity) when you double the amplitude (loudness)?
It quadruples.
(The intensity is proportional to the square of the amplitude, I ∝ A2).