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Difference Between Sound, Noise and Music

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What is Sound and How is it Produced?

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We know that sound is produced from everything. Our days, our activities in fact entire human living is based on sound. We begin our day with an alarm clock followed by many variants of sounds such as music, noise, vehicles, etc. Basically sound is the most essential part of our lives. Every living thing such as the roaring of a lion, crying baby, ultimately when we pour water into a glass we witness the production of sound. Now the question that arose is what is sound? 

A sound is a form of energy. The study of sound starts with the properties of sound waves and the types of sound waves. Basically sound is a form of wave or vibration. Human ears can sense the sound waves ranging from 20Hz to 20KHz, known as audible sound range. There are many variants of sounds such as pleasant sound, unpleasant sound, music, noise, soft, loud, etc. In this article, we will study the difference between sound noise music, what is meant by sound, what is the meaning of sound, types of sounds in physics, what is noise, etc.


Types of Sound

Before starting with types of sound, let us understand what is sound in physics? Sound waves are longitudinal, mechanical waves. Sound is caused by the back and forth vibration of the particles of the medium through which the sound wave is propagating. The vibrations of the object allow particles in the surrounding medium in vibrational motion, causing the auditory receptors to detect them. This is known as the sound. 

Though all the bodies that vibrate in the air can indeed produce sound, we can not hear all of them. Our ears are sensitive to a certain frequency range, depending upon this fact there are only two types of sounds i.e., audible and inaudible sound. The audible sound ranges from 20Hz to 20KHz. The sound waves that are below 20Hz are known as infrasonic sounds and the sound waves above 20KHz are known as ultrasonic sound. 

Audible sound is further classified as pleasant sound and unpleasant sounds. So the pleasant sounds are the group of sounds that makes us feel relaxed like good music such as playing the piano, singing songs etc. At the same time, there are a certain set of sounds that will be unbearable or cause irritation to the hearing body like loud noises such as barking dogs, drilling machines etc. We can say audible sound can be classified into music and noise. 


What is Noise and Types of Noise?

Now, what is noise? So, noise is a type of sound, it is really important to distinguish between what is noise and what is sound. Noise is a type of sound and it can be defined as a type of sound that can be unpleasant, unwanted, annoying or too loud for human ears. 

Human ears are highly sensitive and excellent at identifying what is noise. Generally, noise is an annoying tone of sound that causes mild to major discomfort or irritation. These sound vibrations pierce through the background noise that accompanies our lives.

When it comes to measuring the different types of noise, we want to replicate how the human ear identifies noise to get an accurate interpretation of its impact. Thus, generally, we use something called the A-weighted frequency, which is much more sensitive between the 500 Hz and 6 kHz range. There are four different types of sound, as listed below:

  1. Continuous noise

  2. Intermittent noise

  3. Impulsive noise

  4. Low-frequency noise

Let’s discuss the four types of noise one by one as follows:

1. Continuous Noise:

  • As the name suggests it is a type of noise that is produced continuously. 

  • The examples of continuous noise are all the machines that run continuously without any breaks such as while riding a car we hear the sound of functioning parts like engine, in factories large machinery produce continuous noise.

2. Intermittent Noise:

  • The intermittent noises are such noises that are not produced continuously. Intermittent noises are produced continuously but with intermediate breaks.

  • The best examples for the intermittent noises are drilling machines, which we might have seen during the destruction or construction of any building we use drilling machines that produce unbearable sound. Another example of intermittent noise is drilling machines used by a carpenter or the dentist. 

3. Impulsive noise:

  • It is a type of noise characterized by a noise level of more than 40dB within a half-second with a duration of one second. 

  • Impulsive sounds incorporate almost all unwanted, instantaneous sharp sounds.

  • Examples of impulsive sounds are bomb explosions, the fringe of weapons, etc.

4. Low-Frequency Noise:

  • Low-frequency noise is produced from the objects around us in everyday life. It is one of the difficult types of noise to reduce, and it makes a silent room still register sound levels around 30-40 decibels.

  • In an office setting, this noise is produced from a heating or ventilation system. In our house, it will arise from the ticking on a grandfather clock. Generally, we don’t even identify these types of noise unless we direct our attention towards them.

 So, these are the different types of noise and what is the meaning of noise physics.


Let us have a look at the difference between sound and noise as listed below:

Difference Between Sound and Noise:

Sl. no

Sound

Noise

1.

Sound is something pleasant to hear.

Noise is the unpleasant sound that the human ear tends to avoid.

2.

Sounds generally have a consistent pitch or constant pitch.

Noise is continuously changing or varying pitch.

3.

Sound is having regular periodic motion.

Noise is having no regular or in other words irregular period motion.

4.

Sound is useful as it produces meaningful communication.

Noise is avoided as it will cause misunderstandings and the production of meaningless communication.

5.

Sound is measured in hertz. Denoted by Hz and it is defined as the number of cycles per unit time. 

Noise is measured in decibels. It is denoted by dB and is defined as the logarithmic ratio of measured intensity to the reference intensity. I.e., mathematically we write,

\[\Rightarrow dB=10log_{10}(\frac{MeasuredIntensity}{ReferenceIntensity})\]


These are the important differences between sound and noise. Similarly, we can note the difference between the sound and music, music and noise, etc. Learning the difference between these will help us understand the terms in a better way.


Did You Know:

  • Noise pollution causes hearing loss that is hazardous to human beings. People who are subjected to loud sounds regularly suffer hearing loss. The technical term used for this is Noise-Induced Hearing Loss (NIHL). Dangerous Decibels (an agency) researched the subject and discovered that out of the four million people in the United States who suffer from hearing loss, about 25% of those cases have NIHL.

  • About 30 million people in the United States are subjected to hazardous sound levels at their workplace every day, according to a study from 2005.

  • In 2015, the Centers for Disease Control and Prevention (CDC), found that mining was the industry with the loudest work environment, followed by manufacturing and construction. About one in eight of the workers in these and similar industries had hearing loss caused by their work environment.

FAQ (Frequently Asked Questions)

1. What is Noise and Musical Sound?

Ans: Noise and musical sound both are the type of audible sound. Noise is a type of sound that is categorized as an unpleasant sound and the human ear is sensitive to it. Whereas musical sound is a type of sound that is categorized as a pleasant audible sound.

2. What are the Two Types of Sound?

Ans: The sound is classified into two types i.e., audible and inaudible sound.