Need Help?

Get in touch with us


Properties of Sound

Grade 8
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.
Properties of Sound


Related topics

Types of Waves

Different Types of Waves and Their Examples

Introduction: We can’t directly observe many waves like light waves and sound waves. The mechanical waves on a rope, waves on the surface of the water, and a slinky are visible to us. So, these mechanical waves can serve as a model to understand the wave phenomenon. Explanation: Types of Waves: Fig:1 Types of waves […]

Dispersion of Light

Dispersion of Light and the Formation of Rainbow

Introduction: Visible Light: Visible light from the Sun comes to Earth as white light traveling through space in the form of waves. Visible light contains a mixture of wavelengths that the human eye can detect. Visible light has wavelengths between 0.7 and 0.4 millionths of a meter. The different colors you see are electromagnetic waves […]


Force: Balanced and Unbalanced Forces

Introduction: In a tug of war, the one applying more force wins the game. In this session, we will calculate this force that makes one team win and one team lose. We will learn about it in terms of balanced force and unbalanced force. Explanation: Force Force is an external effort that may move a […]


Magnets: Uses, Materials, and Their Interactions

Introduction: Nowadays magnets are widely used for many applications. In this session, we will discuss the basics of magnets and their properties, and the way they were and are used. Explanation: Magnets: Magnetic and Non-magnetic Materials: Poles of a Magnet: Fig No. 1.2: Poles of a magnet Compass: Interaction Between Magnets: The north pole of […]


Other topics