Week 3 termi

• The simplest sound waves are sinusoidal waves, which have definite frequency, amplitude, and wavelength.
• The human ear is sensitive to waves in the frequency range from about 20 to 20,000 Hz, called the audible range
• in a longitudinal wave the displacements are parallel to the direction of travel of the wave, so distances x and y are measured parallel to each other.
• in a transverse wave the displacements are perpendicular to the direction of travel of the wave.
• Infrasonic


  Sound waves of frequencies below 20 Hz (inaudible)
• Ultrasonic


  Sound waves of frequencies above 20000 Hz (inaudible)
• Audible sound

  Sound waves of frequencies 20 Hz to 20,000 Hz
• There are three characteristics of Musical Sound

  • Pitch or Frequency
  • Quality or Timbre
  • Intensity or Loudness
• Pitch is the characteristic of sound which is the sensation conveyed to our brain by the sound waves falling in our ears. It depends directly on the frequency of the incident sound waves.
• The quality of the sound is the one which helps us to distinguish between the musical notes emitted by the different instruments or voices, even though they have the same pitch and loudness.
• The intensity of sound at a point is defined as the average rate of flow of acoustic energy(Q) per unit area situated normally to the direction of und wave.