discovery x-rays

Magnetic Resonance Imaging - It is also called Nuclear Magnetic Resonance (NMR) spectroscopy as it is based on this phenomenon. It is a diagnostic technique that provides high quality cross-sectioned two or three - dimensional images of organs without having X-rays or other radiations. Th..

Biologists estimate that there are about 30 million species of living organisms inhabiting this biosphere and only a million and half of it have been discovered and described so far. The species of plants and animals identified so far exhibit a great deal of variation in their form, structure ..

Summary - Biologists estimate that there are about 30 million species of living organisms inhabiting this biosphere and only a million and half of it have been discovered and described so far. The species of plants and animals identified so far exhibit a great deal of variation in their form, struc..

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Modern Physics..

> kilometers from the earth. Sun's light travels at a great speed of 3x10 5 kilometers per second, and takes about 8 minutes to reach us. Light takes about 4.3 years to reach us from the next nearest star called Alpha Centauri. The sun is a mass of hot gases, about 109 times bigger in siz..

An electron is defined as a subatomic particle which carries one unit of electrical charge (1.602 x 10 - 1 9 C) and has a mass (9.1 x10 - 2 8 g). The mass of an electron is almost negligible, being 1/1837 t h the mass of an atom of hydrogen. The charge of an electron is..

The position of a point in a plane is determined by two coordinates. The method is as follows: Two mutually perpendicular lines (straight lines) XX' and YY' are drawn as shown in the figure. These straight lines are termed as coordinate axes, the one (usually drawn horizontally) is called the ..

Rectangular coordinate system - The position of a point in a plane is determined by two coordinates. The method is as follows: Two mutually perpendicular lines (straight lines) XX' and YY' are drawn as shown in the figure. These straight lines are termed as coordinate axes, the one (usually drawn h..

Bond length is the average distance between the centres of the nuclei of two bonded atoms in a molecule. It is expressed in Angstrom units () or picometers(pm). 1 = 10 - 1 0 m and 1pm = 10 - 1 2 m. It is determined with the help of X-rays diffraction and other spectroscopic methods...