what is noise for class 8
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Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing. From a physics standpoint, noise is indistinguishable from sound, as both are vibrations through a medium, such as air or water.
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Noise pollution, also known as environmental noise, is the propagation of noise with harmful impact on the activity of human or animal life. The source of outdoor noise worldwide is mainly caused by machines, transport and transportation systems.[1][2]Poor urban planning may give rise to noise pollution, side-by-side industrial and residential buildings can result in noise pollution in the residential areas. Research suggests that noise pollution is the highest in low-income and racial minority neighborhoods.[3] Documented problems associated with urban environment noise go back as far as ancient Rome.[4]
High noise levels can contribute to cardiovascular effects in humans and an increased incidence of coronary artery disease.[5] In animals, noise can increase the risk of death by altering predator or prey detection and avoidance, interfere with reproduction and navigation, and contribute to permanent hearing loss.[6]
High noise levels can contribute to cardiovascular effects in humans and an increased incidence of coronary artery disease.[5] In animals, noise can increase the risk of death by altering predator or prey detection and avoidance, interfere with reproduction and navigation, and contribute to permanent hearing loss.[6]
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