Sound

• Continuous disturbance that transfers energy without any net displacement of the medium particles is called wave.

 

• Different types of waves on the basis of their production are mechanical wave, electromagnetic wave and matter wave.

 

• Different types of mechanical waves on the basis of their propagation transverse wave and longitudinal waves.

 

• Mechanical waves need a medium for its propagation.

 

 

• Laws of reflections of sound:

  (i) The incident sound, the reflected sound, and the normal to the screen at the point of incidence – all lie in the same plane.

  (ii) The angle of reflection of sound is always equal to the angle of incidence.

• Echo
  • Reflection  of  sound
  • Sensation of sound persists   in the human brain
  • Minimum distance to hear echo

• Reverberation
  • Persistence of sound by repeat…