Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Pollution due to Noise:
Sound is an important means of communication, but high levels of noise could damage hearing, and cause deterioration in capacity to concentrate on work. Noise is referred to as unwanted sound that is usually unpleasant. The loudness of noise is measured in decibels (db). The quietness of a lonely place at night may be represented by, 20 db; a library where people are not supposed even to talk loudly, by 40 db; the sound level when you hear a radio broadcast, by 60 db; a factory or a motor-cycle may produce uncomfortable noise at 100 db, if you stand near a jet engine of the airlines it may be hard to bear the noise of 120 db level. High level of noise is harmful to man. Hearing loss begins with prolonged exposure (8 hours or more) to noise at 80-90 db or more.
Can you think of some places where there is high level of noise? The level of noise is very high in certain industries, such as the ones dealing with iron and steel manufacture, motor vehicle production, metal products fabrication. printing and publishing, lumbering and wood products, and textile manufacturing. Busy streets in big towns, and the places near the railway tracks are so noisy that if you were living there, you would hardly be able to sleep.
It is often said that noise pollution is different from air, soil and water pollution. let us see how? Noise pollution differs significantly from air, soil and water pollution in the sense that it decays almost instantaneously and leaves no residues, whereas a majority of pollutants of air, soil and water remain as such for very long durations. Now the question arises how can noise pollution be reduced? Maintenance of machinery and automobiles, etc. in good condition reduces noise. Loudspeakers which blare music at night during celebrations of festivals or marriages cause tremendous strain on the whole neighbourhood. Rules that already exists to stop such noise should be enforced by local administration. Planting of trees along roads also reduces noise levels in residential areas or if work places.
Define Glucose and Fructose - Abnormal Constituents of Urine Abnormal Constituents of Urine The detection of abnormal constituents in urine indicates the presence of certa
who is the first scientist
What is the professional name for the person who studies fossils? Paleontologist
Starch is a non-reducing substance , as except one carbonyl group, all other carbonyl groups are involved in glycosidic bond formation. It may be hydrolyzed by boiling with hyd
FIRST AID PROCEDURE FOR ELECTRIC SHOCK : Although the procedure described is usually followed, there are occasions when other matters have to be considered and therefore the proce
Explain Maintenance of pH - Functions of Bile Maintenance of pH: Bile neutralises the hydrochloric acid and helps to maintain a suitable pH. This prevents the injurious effects
what makes a mineral a mineral? The properties of minerals: There are seven main properties that are used to describe and classify any mineral found. All seven properties are
Autoclaved Heated in an instrument called as autoclave in which the boiling point of water can be elevated by increasing pressure more than atmospheric pressure.
Define Ribosomes Ribosomes are small, but complex structures, approximately 20 to 30 nm in diameter, containing two unequally sized subunits, referred to as large and small sub
nervous system assignments
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd