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Rev. Notes > IGCSE > Sound
 
 
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Nature of sound waves

Experiment: Sound can not travel through vacuum

Production of sound
Characteristics of sound

Medium to transmit sound waves

Speed of sound in different media

Echo

Audible frequency range

 

Echo

When sound is incident on a big surface , part of the sound energy is reflected. The reflected sound waves heard after a silence, is called an echo. Human can distinguish an echo if the silent period is more than one tenth of a second. Clear good echos are produced if;

(a) the distance between the reflector and the sound source is more than 30 meters.

(b) the area of a reflector is large compared to the wavelength of the incident sound.

(c) the incident sound is high pitched i.e. of a high frequency.

Echo sounding is used to survey the depth and nature of the seabed. Knowing the speed of sound in a prticular medium, one can calculate the distance between the sound source and the reflector by timing the echo.

 
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View Comments on this Chapter - Total Comments (2)
 
muaskerr Said :
Is goopd
 
  19/05/15 04:42 PM
   
Deka Anggawira Said :
Good Job, KEEP IMPROVE AND ADD THE POSITIVE Information
 
  17/02/13 01:30 PM
 

 

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