What is Physics?

Humans have always been curious
about the world around them. The night sky with its bright celestial objects
has fascinated humans since time immemorial. The regular repetitions of the day
and night, the annual cycle of seasons, the eclipses, the tides, the volcanoes,
and the rainbow have always been source of wonder. The world has an astonishing
variety of materials and a bewildering diversity of life and behavior. The
inquiring and imaginative human mind has responded to the wonder and awe of
nature in different ways. One kind of response from the earliest times has been
to observe the physical environment carefully, look for any meaningful patterns
and relations in natural phenomena, and build and use new tools to interact
with nature. This human Endeavour led, in course of time, to modern science
technology.

The interplay of theory and
observations or experiments is the basis of the progress of science. Science is
ever dynamic. There is no ‘final’ theory in science and no unquestioned
authority among scientists. As observations improve in detail and the experiment
became to yield new results. Theories must have account for them, if necessary,
by introducing modifications. Sometimes modifications the modifications may not
be drastic and may lie within the framework of existing theory. For example, when
Johannes Kelper (1571-1630), examined the extensive data on planetary motion collected
Tycho Brahe (1546-1601) the planetary  circular orbits in heliocentric theory (sun at
the centre of the solar system) imagined by
Nicholas Copernicus (1473-1543)had to be replaced by elliptical orbits
to fit the data better. Occasionally   , however, the existing theory is simply
unable to explain new observations. This cause a major upheaval in science. In
the beginning of the twentieth century, it was realized that Newtonian mechanics,
till then a very successful theory, could not explain some of the most basic
features of atomic phenomena. Similarly, then accepted wave picture of light
failed to explain the photoelectric effect properly. This led to the development
of a radically new theory (Quantum Mechanics) to deal with atomic and molecular
phenomena.

Physics is a basic discipline in the
category of Natural Science, which also include other discipline like Chemistry
and Biology. The word Physics comes from a Greek word meaning nature. We can
broadly describe physics as a study of basic laws of nature and their
manifestation in different natural phenomena

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By teenstudents Posted in physics

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