Sound waves are vibrational disturbances that transmit energy through a medium by compressing and rarifying the molecules of that medium. The frequency of a sound wave is measured in Hertz (Hz) and determines its pitch, with human hearing ranging from 20-20,000 Hz. Below 20 Hz are infrasonic sounds like some animal calls, and above 20,000 Hz are ultrasonic sounds like dog whistles. The fundamental frequency is the lowest (or basic) frequency that a sound source can produce.

1. Sound waves
A vibrational disturbance that involves
mechanical motion of molecules
transmitting energy from one place to
another.
Sound waves expirement

2. Compression
• Reducing a signal's output level in relation to
its input level to reduce dynamic range.
çompression waves test

3. Frequency
• The # of times per second that a sound source
vibrates, expressed in hertz (Hz).
ƒrequency test

4. Hertz
Unit of measurement of frequency; numerically
equal to cycles per second (cps).

5. Infrasonic
• The range below the frequencies audible to
human hearing.
Look onto the frequency video again, the sounds
you cannot hear, whicha re also measured in
hertz (last slide) are examples of infrasonic
sound

6. Ultrasonic
• The range above the frequencies of human
hearing.
Dog whistles

7. Pitch
• The subjective perception of frequency - the
highness or lowness of a sound.
Pitch

8. Fundamental
• The lowest frequency a sound source can
produce. In other words, it is also called the
first harmonic or primary frequency which is
the lowest, or basic, pitch of a musical
instrument.
Low frequency

9. Sound Frequency Spectrum
• The range of frequencies audible to human
hearing: about 20 to 20,000 Hz.
Return to previous video

10. Octave
• The interval between two frequencies that
have a tonal ratio of 2:1.
Mariah Carey octaves

11. Bass
• The low range of the audible frequency
spectrum; usually from 20 to 320 Hz
Bass

12. Midrange
• The part of the frequency spectrum to which
humans are most sensitive; the frequencies
between roughly 320 Hz and 2,560 Hz.
Return to video on slide 8

13. Treble
• Frequency range between roughly 5,120 Hz
and 20,000 Hz, the highest two octaves
audible to human hearing in the sound
frequency spectrum.

14. Equalization
• A signal-processing device that can boost,
attenuate, or shelve frequencies in a sound
source or sound system.

15. Amplitude
• The magnitude of a sound wave or an electric
signal, measured in decibel's.

16. Decibel (dB)
• A relative and dimensionless unit to measure
the ratio of two quantities.

17. Wavelength
• Distance between two peaks of a wave

18. Velocity
• Speed in a given direction

19. Harmonic
• Is a multiple of the fundamental frequency

20. Phase
• Factor in the interaction of one wave with
another, either acoustically or electronically

21. Citation
• 102715_youtube_mist8k_liquidsoundwavetest
• 102715_youtube_chappy128_candleinthecompressionwave
• 102715_youtube_buzzfeedblue_ultimatehearingtest
• 102715_youtube_phenomenoncinema_highandlowpitchtest
• 102715_youtube_adminofthissite_20Hzto20KHz
• 102715_youtube_f*ckingbrill_mariahcarey5octavesin1minute
• 102715_youtube_DanielBurton_basstest