uses of gamma rays

Also called as freons, they belong to a group called chlorofluorocarbons (CFC). They are used as propellant in aerosols or as refrigerants in domestic refrigerators, deep freezers, air conditioners. CFM are not disintegrated in air, but rise to troposphere. There they are dissociated due ..

The electron beam emitted by a filament is accelerated through a large potential difference in an electron gun. The electron beam is subjected to a magnetic field created by an electromagnet. This beam falls on the object. This beam passes through the object and enters again a magnetic field produ..

- particle and forms an inert gas radon The transformation is given by Both the mass (226 - 4 = 222) and the charge (88 - 2 = 86) must be conserved. Radon is unstable and also decays with the emission of an α - particle: Radium emits γ - rays as well as..

Detection and Diagnosis of Cancer - 1) Histologic and Cytologic methods involve Biopsy and histological examination of the affected tissue. For e.g., Paps test is employed to detect cervix cancer. Blood tests for abnormal WBC count for Leukaemia, Bone marrow Biopsy are also used to detect..

Astigmatism - Astigmatism is the most common vision problem resulting in distorted images, as light rays are prevented from meeting at a common focus. Astigmatism may accompany Hypermetropia or Myopia What Causes Astigmatism? Normally the cornea is spherical in shape But in an astigmatic ..

Sign Convention for Spherical Mirrors - The following sign convention is used for measuring various distances in the ray diagrams of spherical mirrors: All distances are measured from the pole of the mirror. Distances measured in the direction of the incident ray are p..

All radioactive decays follow first order kinetics. Therefore, the half-life of a radioactive element is independent of the amount of sample. With the help of half-life values of a suitable radioisotope of an element, which is present in a rock, or in an artefact, the age of the rock and the artefa..

>This ratio is always a constant for a given pair of media. Lens A lens is a transparent medium that has at least one curved surface. Convex Lens A convex lens is thicker in the middle and thinner at its edges. Concave Lens A concave lens is thicker at the edges and thinner in the middle. Optic Cen..

The light coming from an object enters the eye through cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image on the retina. The light sensitive cells of the retina gets activated with the incidence of light and generate electric signals. T..

Solar energy is responsible for the blowing of wind. The intensity of sun-rays is stronger near the Equator than at the Polar Regions. Due to unequal heating of the earth's surface, cooler air from the Polar Regions flow towards the equatorial regions to fill the space created by the ho..