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    4 types of noise and how you can reduce them

    If a tree falls in a forest and nobody is around to hear it… does it make a sound? This age-old question has been asked for centuries, with mixed interpretations. Some argue that types of noise should only be classified in the physical sense. Millions of people have been there to see trees fall in […]


    4 types of noise and how you can reduce them

    OCTOBER 14, 2019

    If a tree falls in a forest and nobody is around to hear it… does it make a sound?

    This age-old question has been asked for centuries, with mixed interpretations. Some argue that types of noise should only be classified in the physical sense. Millions of people have been there to see trees fall in the forest, and each of them report a sound. Even more, science shows that these trees should make a sound. The compressions and rarefactions that are caused by the tree falling have been shown to emit audio frequencies.

    Critics, however, say that even though these things are true, the tree still doesn’t make a sound. They take the philosophical approach by quoting George Berkeley, who says, “to be is to be perceived.” Since nobody is there to hear the tree fall, the event is outside of the human experience, and, consequently, the sound doesn’t exist.

    People debate on this argument and will continue to do so for hundreds of years. There may not be a consensus on whether the noise is there or not, but we can agree that the thought experiment shows how important of a role noise plays in helping us understand events. Hikers look up and all around when they hear a ‘whooshing’ noise from a falling tree. This reaction helps keep them safe. The tone of voice coming out of an impassioned person can tell us whether the tears streaming out of our eyes are happy or sad. A blaring car horn lets you know that there’s somebody in your blind spot.

    How does sound work?

    We hear a million (roughly estimated) different sounds and noises each day. Sound is produced through vibrations traveling through the air. Each sound travels from its source as pressure waves through the air in all directions. These waves have different intensities, pitches, and tones that determine whether the types of noise they make are loud, soft, high, or low. A louder sound has a higher intensity, while a softer sound has a lower intensity. Likewise, sounds with shorter wavelengths have higher pitches, while sounds with longer wavelengths have lower pitches.

    All these elements factor into the pressure waves that vibrate our inner ear. Through this vibration, we hear the sensation of sound.

    Different types of noise

    Noises are categorized in four different ways. The things you hear throughout the day can be either a continuous noise, intermittent noise, impulsive noise, or low frequency noise. By understanding these categorizations, you’ll better understand the measures you can take to protect your hearing.

    Continuous noise

    Continuous noise comes from objects or machines that run without interruption. These noises are noticeable and happen all around us wherever we go.

    In a factory setting, these types of noise emanate from large machinery that works continuously to keep production consistent. In a car, you hear continuous noises from functional objects, like a running engine, or from other things, like the “thrum, thrum, thrum” noises you hear while driving with your windows down.

    Intermittent noise

    Intermittent noises are infrequent but regular within your daily life. Generally, they come from loud bursts that you notice but are not surprised by.

    These types of noise can sometimes have a large impact on your quality of life. For example, if you live next to railroad tracks, you may wake up in the middle of the night to the sounds of a freight train’s horn. Many people pay more money for housing to avoid this type of problem. This can also be shown by the lack of development around airports. Many people don’t want to live in a place where they will hear planes taking off at all hours of the day and night.

    ​Impulsive noise

    An impulsive noise, on the other hand, is not regularly scheduled or recognized. Instead, it is a surprising burst or sound that causes people to look up to see what’s going on.

    Frequently, these types of noise are heard in restaurants as waiters or waitresses accidentally drop a pile of dishes on the ground. When this happens, the restaurant generally calms down a little as people look around for the source of the noise. Strangers shouting on the street or loud bursts from construction sites are also considered impulsive noises.

    Low frequency noise

    A low frequency noise comes from objects around us in everyday life. It is one of the hardest types of noise to reduce, and it makes a seemingly silent room still register sound levels around 30-40 decibels.

    In an office setting, this noise comes from a heating or ventilation system. In your home, it comes from the ticking on a grandfather clock. Generally, we don’t even recognize these types of noise unless we direct our attention towards them.

    Measuring these types of noise

    Measuring how these types of noise impact your hearing can be easy for some and difficult for others. With continuous or low frequency noise, it’s easy to measure the sound levels. Mobile apps like Soundprint give you access to a sound level meter that can be used to tell you if the restaurant you’re dining in is going to damage your ears enough to make you shout for the rest of the night.

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    How to Reduce Noise Pollution?

    Noise pollution can be reduced by turning off appliances when not in use, planting trees, using earplugs,regular maintenance of vehicles & machines etc.

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    How to Reduce Noise Pollution?

    We can Reduce Noise pollution by turning off appliances when not in use, use of earplugs, lowering the volume, planting more trees, regular maintenance of vehicles and machines etc. By controlling noise we can control negative health effects that noise pollution has on everyone.

    What is Noise?

    Noise is unwanted sound. A sound which has unpleasant effects and discomfort to ears is called noise. Generally sound generated by vehicles, horns, loudspeakers, planes, construction etc. are reasons for noise pollution.

    It is measured in decibel (dB). Normally noise which is less than 115 dB is tolerable (for a shorter period).

    Noise pollution is also considered as environmental pollution although it is not as harmful as air, water or soil pollution effects of noise pollution for a longer period can be severed.

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    How to Reduce Noise Pollution?

    We can reduce noise Pollution by following below mentioned Tips:

    Turn off Appliances at Home and offices

    We can turn off home and office appliances when not in use such as TV, games, computers etc. it can create unnecessary stress on ears. We can save electricity also when we turn them off.

    Shut the Door when using noisy Machines

    We can shut the door after we turn on dishwashers or washing machines for rooms where it is kept or we can turn them on before leaving the house so that overlapping of exposure to loud noises can be reduced

    Use Earplugs

    Use of earplugs or earmuffs can bring down loud noises to a manageable level. Earplugs are small inserts that fit into our ear canal. And earmuffs fit over the entire outer ear to form an air seal keeping ears safe from loud noises.

    Lower the volume

    We can listen to songs, radios, TVs in lower volume when listening from headphones or speakers.

    Stay away from Noisy area

    Noise producing industries, airports, vehicles should be far from residential areas as it is very dangerous for infants and senior citizens.

    Follow the Limits of Noise level

    Community law should check the use of loudspeakers, outdoor parties as well as political public announcements.

    Control Noise level near sensitive areas

    There should be control on noise level (Silent zones) near schools, hospitals. Place noise limits boards near sensitive areas.

    Go Green by planning trees

    We can plant more trees as they are good noise absorbents. According to studies, it can reduce noise by 5 to 10 decibels Db around them.

    Create Healthy noise to eliminate unwanted noise

    If we can’t eliminate unwanted noise coming from outside then we can create healthier noise such as music, singing birds or waterfalls in homes or offices.

    Use Noise absorbents in noisy machineries

    We can check for pieces of machinery which are creating noise due to vibrations and put some noise absorbents to reduce noise.

    Use Proper Lubrication and Better maintenance

    We can use proper lubrication as well as better maintenance of machines to reduce noise pollution and improve efficiency. It reduces friction between movable parts and helps to reduce noise.

    Notify Authorities about Disobedience of Noise Rules

    We can notify government agencies if someone is not following rules and regulation regarding noise levels.

    Regularly check noise levels

    Regularly checking noise level in an industrial complex and indoor to keep noise level within the limit.

    It is necessary to control the noises created around us. It is necessary to aware people around us through various mediums. We can start from ourselves to spread awareness about noise pollution and its effects on human and the environment. Limit for noise at daytime is 55 dB and in the night it is 30 dB to avoid health effects.

    Learn more about noise level Monitoring

    Governments are taking steps to reduce noise pollution in mostly all countries which is a very good sign.

    We can follow below mentioned tips for how to reduce noise pollution.

    Also you would be interested in Ways to reduce air pollution from factories.

    What are effects of Noise Pollution?

    Constant exposure to loud noises can damage eardrums and loss of hearing. It also reduces the sensitivity of eardrums to pick up small sounds.

    Noise pollution can affect health and shows signs of aggressive behaviour, sleeps disturbance, increases in stress level, fatigue

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    Q 9 List sources of noise pollution in your surroundings...

    Free solutions for NCERT Solutions - Science , Class 8 Chapter 14 - Sound Exercise question 23. These explanations are written by Lido teacher so that you easily understand even the most difficult concepts

    NCERT Solutions Class 8 Science Solutions for Exercise in Chapter 13 - Sound

    Prev Question 23 Next

    Q 9) List sources of noise pollution in your surroundings.

    Answer: Solution 9:

    Major causes of noise pollution are sounds of vehicle horns, explosions including the bursting of crackers, machines, loudspeakers, etc. Appliance in the home may lead to noise pollution like Television and transistor radio at high volumes, some kitchen appliances, desert coolers, air conditioners, all of them may lead to contribute to noise pollution.

    Video transcript

    "Hello guys welcome to my channel again now you're going to start the Lido homework station and below we are going to discuss the 9th question of Physics the question 9 is all about list sources of nice positions in your surroundings and the answer is. beginning with that window on your yourself because we can experience in noise pollution everywhere now coming to the reasons for the noise pollution sources the first one is The first one is the crackers next one is music concerts third one is the functions for Tony's weddings the first one is the highest function. unauthorized functions and the 61 is allowed DJ Lidos and they have many other things ago. And I thank you for watching the video please relax a comment and subscribe. Thank you"

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