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Sound

Sound

Audible sounds:

  • The audio spectrum extends from approximately 20Hz to 20,000 Hz.Sounds of frequency between 20Hz and 20,000Hz can be heard by human ear

Infrasonic sounds:

  • Sounds of frequency less than 20Hz are called �infrasonics�.

Ultrasonic sounds:

  • Sounds of frequency greater than  20,000Hz are called�ultrasonics�.

  • Ex: Sound produced by bats.

Nodes:

  • The points of no displacement when standing waves are formed.

Antinodes:

  • The points along the medium which vibrate back and forth with maximum displacement.

Sound Intensity:

  • The loudness of sound is directly proportional to the square of the amplitude or intensity (I). It is convenient to use a logarithmic scale to determine the intensity level b = 10 log (I/I0)

Pitch:

  • Pitch is the highest or lowest sound an object makes.

Beats:

  • Beats are the periodic and repeating fluctuations heard in the intensity of a sound. Two sound waves of nearly same frequencies interfere with one another to produce beats

  • The intensity of the resultant wave at a given point in the medium becomes maximum (waxes) and minimum (wanes) periodically.

Doppler Effect:

  • The apparent change in the frequency of sound due to relative motion between the sound source and observer is called Doppler Effect.

Echoes:

  • The sound obtained by reflection at a wall, cliff or a mountain is called an echo.

Diffraction:

  • When waves encounter an obstacle with an edge, some of the wave energy bends around the edge behind the obstacle. This bending is called diffraction.



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