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Radiocarbon dating of historical wooden - derived objects is based on the knowledge that the cosmic ray intensity (responsible for 1 4 C production) has been practically constant for thousands of years. 1 4 C is formed in the upper atmosphere by the action of cosmic ..

Radiocarbon The 1 4 C so produced is eventually converted into CO 2 , which in turn is incorporated into plants and trees by the process of photosynthesis and then finds way into animals, which eat plants. As there is a natural plant-animal cycle, an equilibrium is set up and all living matter cont..

Practical Applications of Joule's Heating - This heating is inevitable in any electrical circuit. Since the energy lost by the flowing charges ends up as disorderly thermal motion, the phrase 'ohmic dissipation' is also used to describe it. Often, this is an undesirable effect. ..

When free space is the communication channel, antennas radiate and receiver the signal. Theory shows that the antennas operate effective only when their dimensions are of the order of the magnitude of wavelength of the signal being transmitted...

Frictional Effects - An oscillator, in actual practice, almost always lies in a resisting medium, like air, oil etc., where part of its energy is dissipated in overcoming the opposing frictional or viscous forces and its amplitude, therefore, goes on decreasing progressively. Su..

The experiment illustrated in figure shows the effect of pressure on the melting point of ice. A thin copper wire passes round a large block of ice and two weights are attached to the free ends of the wire. The pressure of the wire lowers the melting point of ice in contact with the wire..

In Louisiana (USA) and Gulf of Mexico large sulphur deposits occur at a depth of about 300-400 metres below the earth's surface. Layers of soft sand, clay and rocks over these sulphur beds make it practically impossible to extract sulphur from the deposits. Hermen Frasch in 1894 devised ..

Green manuring is the practice of growing and ploughing in, the green crops, into the soil. It is a cheap and effective method that increases soil fertility as it can supplement farmyard and other organic manures and is more cost effective. Green manures add nitrogen ..

Flowing or moving air is called wind. By the virtue of this motion, the wind possesses kinetic energy. A windmill is used to make practical use of wind energy. The force of the wind rotates the blades of the windmill. Wind should flow continuously with certain minimum speed (say 20 km/ho..

A report by scientists at the United Nations Environment Program (UNEP) said the Asian Brown haze is a three kilometer deep blanket of pollution in the sky, which stretches across South Asia, and has been caused by the spectacular economic development experienced by this part of the world. The haz..