7 Simple leaves have been shown to be better dust collectors than the trees having compound leaves. 2 Nearly natural and vertical orientation of leaves results in lesser dust deposition as in case of Eucalyptus. 4–6 Phyllotaxy, leaf orientation and sessile or semi sessile nature of leaves also plays an important role by providing maximum area for dust deposition keeping leaves in a horizontal direction. 3 Factors affecting dust pollutionĬapacity of leaves as dust receptors depends on surface geometry, epidermal and cuticular features of leaves and height & canopy of the tree. Plants grasp the dust and loam of topsoil the soil-inhabitant tiny plants also reduce air-pollutants and break or degrade many poisonous chemicals those go into the soil. Particle having size lesser than diameter of stomata apertures directly enters the sub-stomatal cavity and comes in contact with the spongy parenchyma of the leaf tissue, larger particles gets access into the leaf interior by getting dissolved in water and carbonic acid discharged by the stomata itself.
2 After deposition dust particles have a tendency to stick to the leaf surfaces for a definite period of time till they get washed off with rain or shredding of the leaf itself. When the air current passes through a tree, some portion of the dust particle adhere to the upper and lower portion of the leaves, some of these are bounced back or deposited elsewhere depending upon the size and character of the particle, wind velocity and the surface area of deposition. 1 Aerosols being small enough to be suspended in air have an affinity to adhere to the solid surface coming in contact with it. The current scenario of large scale deforestation destruction of biota and other ecosystem components are being attributed to be the effect of dust pollution.
Activities such as coal mining, quarrying, stone crushing, thermal power plants, cement industries etc., adds huge quantities of dust to the environment. In India 30-35% of air pollutants comprises of dust particles. 1.864 Determine the moment of inertia of the rotating meter stick with the particle attached, and use that result to find the total angular momentum.Dust particles form a major part of air pollutants arising due to industrial processes and pose serious threat to the ecosystem.
(a) Calculate the angular momentum of the system when the stick is pivoted about an axis perpendicular to the table through the 50.0-cm mark.375 Determine the moment of inertia of the rotating meter stick with the particle attached, and use that result to find the total angular momentum. The meter stick rotates on a frictionless, horizontal table with an angular speed of 2.00 rad/s.
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