Science In Everyday Life
- 60% Off₹10.00 ₹4.00Get this eBook
About this eBook
warranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties, including without limitation warranties of fitness for a particular purpose. No warranty may be created or extended by sales or promotional materials. The advice and strategies contained herein may not be suitable for every situation. This work is sold with the understanding that the publisher is not engaged in rendering legal, accounting, or other professional services. If professional assistance is required, the services of a competent professional person should be sought. Neither the publisher nor the author shall be liable for damages arising herefrom. The fact that an organization or Web site is referred to in this work as a citation and or a potential source of further information does not mean that the author or the publisher endorses the information the organization or Web site may provide or recommendations it may make. Further, readers should be aware that Internet Web sites listed in this work may have changed or disappeared between when this work was written and when it is read. TRADEMARKS Cosmos Bookhive, the CBH, Cosmic Ring, Book and the reading Bee logo are trademarks or registered trademarks of Cosmos Bookhive Private Limited India and or its affiliates, in India and other countries, and may not be used without written permission. All other trademarks if appeared or mentioned in the book are the property of their respective owners. Cosmos Bookhive Private Limited, is not associated with any product or vendor mentioned in this book.
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