Science In Everyday Life
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Prologue As each year draws to a close, the editors of Time magazine review the year s newsmakers and select one as representative of the year just passing. This selected newsmaker is then featured in a cover story in the year s final issue. A politician, a chief of state, a scientist-perhaps these are the people you d expect to see featured in the special issue. If so, you might have been as surprised as were millions of others a few years ago to find that Time s Man of the Year wasn t person at all. It was a machine the computer. We are living in the computer age. Most of our day-to-day jobs are being influenced by the use of computers. In some areas such as Science and Technology improvements cannot be achieved without the use of computers. Hence, it has become necessary for each and every one of us to have a basic knowledge about computers. Many people are aware that a computer is a machine that can perform arithmetic operations. But they fail to understand that it is also a machine that can choose, copy, move, compare, and perform other non-arithmetic operations on the many alphabetic, numeric, and other symbols that we use to represent things. The four characteristics of computers which make them very useful tools are their speed, storage capacity, consistency and accuracy. Aided by computers modern science and technology have changed our lives in many dramatic ways. Airplanes, automobiles, communications satellites, computers, plastics, television, robots, drones and what are not only a few of the scientific and technological inventions that have transformed human life. Research by nuclear physicists has led to the development of nuclear energy as a source of power. Agricultural scientists have developed better varieties of plants and highly effective fertilizers. The development of antibiotics and other new drugs has helped to control many infectious diseases. Studies in anatomy and physiology have led to amazing new surgical operations and to the invention of lifesaving machines that can do the work of such organs as the lungs, kidneys, and heart. So what are areas where science is important The first is in everyday human life.
Why is the Sea Blue On a sea voyage in 1921, C.V Raman became fascinated by the sea s stunning blue colour. In the 1870s the English physicist Rayleigh had reasoned that the colour of the sea was just the reflection of the blue sky. However, dissatisfied with this explanation, Raman decided to investigate on his own. The scattering of sunlight by air molecules explains the blue colour of the sky. Through experiments, Raman proved that a similar phenomenon of light scattering by water molecules explains why the sea is blue. When white light from the sun is incident on tiny particles, blue light gets scattered the most and red light the least. This makes both the sea and the sky appear blue. Raman questioned an existing explanation and extended the concept of light