a little physics help anyone?

;Silver iodide precipitate is converted into colloid by adding potassium iodide. The sol obtained consists of (1) negatively charged colloidal particles (2) positively charged colloidal particles (3) neutral colloidal particles (4) both positive and negatively charged colloidal particles 53. Floccu..

Some important uses of dimensional equations are as given below (i) Changing of unit from one system into another system. (ii) Deduction of relations bei ween different physical quantities. (iii) To verify whether the given equation is correct or not. Let us discuss in a li..

The average distance between the sun and the earth is^l.5 x 10 km. The intensity of solar radiation incident on the earth on a unit cross-sectional area, exposed, perpendicularly to the r^s of the sun at an average distance is termed as solar constant. Its value is 1.353\w/m 2 . A little..

Since the surface tension of oil is smaller than that of water therefore oil spreads on water. This property is used to calm down the stormy waves at sea. /(ii) Lubricating oils and paints have low surface tension. So, they can spread properly. ^tii) Action of detergents The dirty cl..

Until 1820 there was no connection between magnetism and electricity. It was Hans Christian Oersted, a Danish professor of Physics, in 1820, observed during a classroom demonstration that an electric current in a wire deflected a nearby compass needle. But an Italian, Gian Dom..

Standard resistors are made of constantan or manganin alloys. Their resistance vary very little with temperature changes. They are used in measuring instruments like multimeter, voltmeter, ammeter etc. Standard resistors are used in experiments where metre bridge, potentiometer, ca..

Metals used in the preparation of machine parts, weapons, household utensils etc. properties like hardness, conductivity, ductility and resistance to corrosion must be increased. No metal in general contain all useful properties. Hence in practice, instead of using a pure metal, an alloy made up..

Life first originated in an aqueous environment and in course of evolution it became fully dependent upon that in a number of ways. Now all the organisms are directly or indirectly dependent upon water for their survival. So water is said to be the liquid of life or elixir of life . Di..

S is a source of light emitting white light (polychromatic) containing all wavelengths. The white light is passed through the substance in the vapour state, with the help of the lens L. Suppose we want to observe the line of absorption spectrum of sodium, sprinkle a littleh..

2 2 of each side of the cube. Decrease in upthrust = 21 g dyne. Loss in weight = 200 g dyne. Now, 2/ = 200. , J-A 26. r=r, +(r 2 -ri)p 27. Let n be the number of little droplets. Now, volume of n little droplets = volume of single d..