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Properties of Sound

Aug 20, 2022

Key Concepts

  1. Amplification
  2. SONAR
  3. Sound and noise
  4. Pitch

Explanation: Properties of Sound


Consider a transverse wave with the amplitude A. After the amplification, the wave’s amplitude changes to A’ . Here, there is an increase in the sound. The sound wave gets louder as the amplitude of the sound increases; amplification increases the sound and alters the wave. If the amplitude decrease or increase is uneven it makes the wave irregular. 

Working of SONAR: 

SONAR has three parts: 

  1. Transmitter 
  1. Obstacle or absorber 
  1. Receiver  


The transmitter is a device that acts as the source of the ultrasound waves; transmitting the ultrasound waves. 


The obstacle is not part of the SONAR. Still, if the sound waves are faced by any obstacles in the transmission, the obstacle or absorber is the main source of the reflection of the sound as sound waves cannot pass through the obstacle; therefore, the sound waves are reflected. 


The sound waves which are reflected by the obstacle are then transmitted back, which in turn are received by the receiver thus, reading the type of obstacle in the radar.  



Sound which is pleasing to hear is called music. 

All the string instruments and the musical instruments produce sound in the form of music which is pleasant to hear, hence called music. 


Noise is the sound that is unpleasant to hear.  

The vehicle horn and the other environmental sound which are unpleasant to hear are called noise.  

Effects of noise pollution: 

Too much production of noise with high decibel intensity is called noise pollution.  

  1. Health issues for the pregnant woman. 
  1. Heart issues among the elderly people.  
  1. Blood pressure related issues.  
  1. Hearing damage.  


The highness and the lowness of a sound wave is called its pitch. 

If the pitch is high, it is called a steep pitch.  If the pitch is low, it is called a base. 


  • Amplification: The sound gets louder as its amplitude increases.
  • Working of SONAR:
    • SONAR has three parts:
    1. Transmitter
    2. Obstacle or absorber
    3. Receiver
  • Music: Sound which is pleasant to hear are called music.
  • Noise: Noise is the sound that is unpleasant to hear.
  • Pitch: The highness and the lowness of a sound is called pitch. If the pitch is high, it is called a steep pitch. If the pitch is low, it is called a base.


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