class boundary

Conclusion - Unfolding the mysteries of the dark and silent space with no known boundaries has always been a dream of the human race. The desires of man has ultimately been accomplished through the exploration of space using various space launching vehicles, space probes and satellites. C..

Is Matter Around us Pure - Impure Substances - Mixtures Impure substances are commonly called mixtures. A mixture is a material containing two or more elements or compounds that are in close contact and are mixed in any proportion. The constituents of mixtures exhibit their individual properties. T..

An atomic orbital is the space around the nucleus in which the probability of finding the electron is maximum. These most probable regions can be diagrammatically represented by cloud density (dot) diagrams. The density of dots (or lack of them) in any region of the cloud diagram, indicates t..

Let us now see what happens when a ray of light is incident on the boundary separating the two media having different densities. A part of the light gets reflected and rest of the light changes its direction as it enters the second medium. The diagram shows how the light gets refrac..

Place a prism on a white sheet of paper with the triangular face on the sheet and trace its boundary ABC. Fix two pins T and S on one side. Place the prism on the boundary ABC. Looking through the other side fix two more pins Q and R in such a way that the all four pins app..

An atomic orbital is the space around the nucleus in which the probability of finding the electron is maximum. These most probable regions can be diagrammatically represented by cloud density (dot) diagrams. The density of dots (or lack of them) in any region of the cloud diagram, indicates the deg..

a) Size of home range varies. It is can be as small as only a few metres (as in forest mouse) to several thousand square kilometres (as in African hunting dogs). b) Exhibiting territoriality may be a seasonal phenomenon for mating, after which the pair joins the wide area (home range). c) The terr..

A mixture may be homogenous or heterogeneous. A homogenous mixture has a uniform composition throughout its mass. For example, sugar or salt dissolved in water, alcohol in water, etc. A heterogeneous mixture does not have a uniform composition throughout its mass. There are visible sharp bou..

Why are Organisms Composed of Cells? - All living organisms are composed of structural and functional units called cells. The body of a living organism may be composed of a single cell - as in unicellular organisms or many cells - as in multicellular organisms. The number of cells in the body of mu..