sound

• Sound

  is a wave that carries energy from one place to

  another.

  It requires a medium for it to be transmitted.
• Sound waves are produced by vibrations.
• Sound waves can be demonstrated on a slinky or a metal spring.
• Sound is an example of a longitudinal wave.
• Long wavelength = Low pitch = Low frequency

  Short wavelength = High pitch = High frequency
• Sounds with frequencies below 20 hertz are called infrasound.
• Sounds with frequencies above 20,000 hertz are called ultrasound.
• ● Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB).

  ● The intensity of sound waves determines the loudness of sounds.

  ● Intensity results from two factors:

  ○ the amplitude of the sound waves; and

  ○ how far they have traveled from the source of the sound.
• small amplitude = quiet sound

  large amplitude = loud sound
• Intensity results from two factors:

  ○ the amplitude of the sound waves; and

  ○ how far they have traveled from the source of the sound.
• The speed of sound is the distance that sound waves travel in a given amount of time.
• Warmer air makes sound travel faster, and colder air makes it travel slower.