noise defined as unwanted sound is becoming a menace these days It is also a

Noise defined as unwanted sound is becoming a menace

This preview shows page 257 - 260 out of 507 pages.

do with the safe and proper disposal of radioactive wastes. noise defined as unwanted sound is becoming a menace these days. It is also a pollutor of atmosphere, though in a different sense. It causes anxiety, stress, fright, loss of hearing and other physiological and psychological effects. under average meteorological sonditions, air temperature drops steadily with altitude. However, if the upper air is warmer than the air beneath it, the atmosphere becomes very stable, and pollutants are trapped under the warm air. This condition is referred to as atmospheric inversion. air pollution can affect global temperature. The increased concentration of carbon dioxide, methane and other gases absorb infrared radiation from earth and prevent its escape and may thus cause a warming known as the Greenhouse effect. another air pollutant which is causing much concern these days is- chlorofluorocarbons, they reach upto ozone layer and destroy the ozone layer by catalysing its decomposition to oxygen. Since ozone acts as a shield against the harmful ultraviolet rays reaching earth's surface, ozone depletion loss may result in increase in human skin cancer and other stresses on biosphere. oxides of nitrogen and of sulphur react in the atmcsphere to produce strong acids. which precipitate in the form of acid rain, snow or dust. This acidic precipitation
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has caused extensive destruction of forests and fisheries, as well as damage to masonry, metals and other materials. Automobile exhaust in the presence of sunlight forms photochemical smog. The photochemical smog has several adverse effects on biological systems. Atmospheric Pollution air pollution in general affects biological systems in different ways, ultimately killing sensitive plants and animals. 10.9 TERMINAL QUESTIONS 1) State whether the following statements are true or false. a) Air in its natural state is pure. b) , Natural air consists of gases, dust and water-vapour. c) Air is polluted mainly through combustion. b) Chlorofluorocarbons accelerates the breaking process of ozone. e) Chlorofluorocarbons aCeIerateS-She breaking and making process of ozone. 2) Write answers in four or five lines. \ a) Distinguish between London-smog and photochemical smog. b) What is the greenhouse effect? ........................................................................................................................ c) What is acid rain? d) How is the Taj Mahal affected by acid rain? ................................................................................................................. ........................................................................................................................ ....................................................................................................................... ....................................................................................................................... e ) How would depletion of ozone from the stratosphere affect human life? ....................................................................................................................... 10.10 ANSWERS Self Assessment Questions 1) i) T ii) T 2) Please refer Section 10.3.:
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Human Activities and Environment-I1 I 3) i) Sulphur dioxide ii) Carbon monoxide iii) 35 iv) 45, 35, 80 4) i) c ii) a iii) b iv) a Terminal duestions 1) B)T b ) T c)T d)F. e)T 2) a) London-smog is a mixture of smoke, fog, ash, dust and sulphur dioxide. Photochemical smog is the result of interaction between hydrocarbons and nitrogen oxides from auto exhaust, in the presence of sunlight. Ozone and PAN, the products of this synergistic reaction, are capable of causing more damage than the original reactants.
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