Is noise pollution worst enemy of man kind ? Why ?
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Noise is generally defined as an unwanted or undesirable sound and the release of unwanted sound into the atmosphere is called noise pollution.
High pitch sound produced by automobiles, machines, power plants, trains, helicopters, aero planes, jets, rockets, public broadcasting systems, T.V., sudden ratting of doors and windows, explosion of bombs, sound of crackers etc. are potent sources of noise pollution. Noise provides alarm system in man’s physical environment. It has been regarded as urban pollution. It has become serious in urban areas due to technologies increasing population, urbanization and industrialisation.
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It is associated with almost all human activities. In 1990, Nobel laureate Robert Koch said, “a day will come when man will have to fight merciless noise as the enemy of health and that day is not far off’. The noise should be taken not only as a factor of annoyance but also as a lethal partner of life. According to Dr. Vem O. Knudsen of university of California, noise, like smog is a slow agent of death. If it continues unabated for the next 30 years it could become lethal to an alarming degree.
Sound is a form of energy. Man is not only affected by the sound energy but also by sound pitch or frequency and intensity. Intensity of sound is measured in decibels (d = deci meaning 10, B for Bell, name of scientist Alfred Grahm Bell). Technically a dB is the amount of sound pressure that equals to 0.0002 microbars (energy of about 10 watts). One dB is the finest sound intensity which can be perceived by human ear and 180 dB is the maximum tolerance limit.
The frequency is defined as the number of vibrations and is denoted by Hertz (hz). One Hertz (hz) is equal to one vibration per second. Man can hear sound from 16 hz to 20,000 hz Less than 16 hz second is infra-audible and sound above 20,000 hz is ultrasonic, some animals however can perceive sounds that are not andible to man. Loudness of sound can also be expressed in sones. One sone is equal to 40 dB at a pressure of 1,000 hz. The loudness of noise is measured on a logarithmic scale called “decibel”.
High pitch sound produced by automobiles, machines, power plants, trains, helicopters, aero planes, jets, rockets, public broadcasting systems, T.V., sudden ratting of doors and windows, explosion of bombs, sound of crackers etc. are potent sources of noise pollution. Noise provides alarm system in man’s physical environment. It has been regarded as urban pollution. It has become serious in urban areas due to technologies increasing population, urbanization and industrialisation.
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It is associated with almost all human activities. In 1990, Nobel laureate Robert Koch said, “a day will come when man will have to fight merciless noise as the enemy of health and that day is not far off’. The noise should be taken not only as a factor of annoyance but also as a lethal partner of life. According to Dr. Vem O. Knudsen of university of California, noise, like smog is a slow agent of death. If it continues unabated for the next 30 years it could become lethal to an alarming degree.
Sound is a form of energy. Man is not only affected by the sound energy but also by sound pitch or frequency and intensity. Intensity of sound is measured in decibels (d = deci meaning 10, B for Bell, name of scientist Alfred Grahm Bell). Technically a dB is the amount of sound pressure that equals to 0.0002 microbars (energy of about 10 watts). One dB is the finest sound intensity which can be perceived by human ear and 180 dB is the maximum tolerance limit.
The frequency is defined as the number of vibrations and is denoted by Hertz (hz). One Hertz (hz) is equal to one vibration per second. Man can hear sound from 16 hz to 20,000 hz Less than 16 hz second is infra-audible and sound above 20,000 hz is ultrasonic, some animals however can perceive sounds that are not andible to man. Loudness of sound can also be expressed in sones. One sone is equal to 40 dB at a pressure of 1,000 hz. The loudness of noise is measured on a logarithmic scale called “decibel”.
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