Physics is so important branch of science that without the knowledge of physics, other branches of science cannot make any progress. This can be seen from the following:
(i) Physics in relation to Mathematics : The theories
and concepts of physics lead to the development of various mathematical tools like differential equations, equations of motion etc.
(ii) Physics in relation to chemistry : The concept of interaction between various particles leads to understand the bonding in the chemical structure of a substance. The concept of X-ray diffraction and radioactivity has helped to distinguish between the various solids and to modify the periodic table.
(iii) Physics in relation to Biology : The concept of
pressure and its measurement has helped us to know the blood pressure of a human being, which in turn is helpful to know the working of heart. The discovery of X-rays has made it possible to diagnose the various diseases in the body and fracture in bones. The optical and electron microscopes are helpful in the studies of various organisms. Skin disease and cancer can be cured with the help of high energy radiation like X-rays, ultraviolet rays.
(iv) Physics in relation to Geology : The internal structure of various rocks can be known with the study of crystal structure. Age of rocks and fossils can be known easily with the help of radioactivity, i.e., with the help of carbon dating.
(v) Physics in relation to Astronomy—Optical telescope has made it possible to study the motion of various planets and satellites in our solar system. Radio telescope has helped to study the structure of our galaxy and to discover pulsars and quasars (heavenly bodies having star like structure). Pulsars are rapidly rotating neutron stars. Doppler effect predicted the expansion of universe. Kepler's laws are responsible to understand the nature of management of the planets around the sun.
(vi) Physics in relation to Meteorology : The variation
of pressure with temperature leads to forecast the weather.
(vii) Physics in relation to Seismology : The movement of earth's crust and the types of waves produced help us in studying the earthquake and its effect.