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radioactive decay seriesthe sequential decay of a given nucleus results in the production of a series of nuclei or elements this series of
electromagnetic waveselectromagnetic waves with different ranges of frequency constitute an electromagnetic spectrum electromagnetic waves are
properties of electromagnetic spectruma spectrum can be divided into 3 regions they are uv region visible region and
basic concepts of electromagnetic spectrumbasic concepts1 when sun light falls on a prism the transmitted light produces a sequence of
lenard atomic modellenard suggested that the atom must have a lot of empty in itlenards model of an atom could not explain about the
different theories of nature of lightwhat are the different theories which explain the nature of lighta the different theories that explains the
thomsons atomic model-according to thomsons atomic model positive charge is distributed uniformly over the entire body of the atom while the
coherence 1 visible light energy is emitted when the excited electrons in atoms undergo transitions to the ground state2 in ordinary light sources
population inversion and luminous fluxpopulation inversion the process in which number of electrons n in a higher2 energy state called metastable
visual photometry the branch of science which deals with measurement of brightness or luminous intensities of light emitted by different sources
interference and diffractioninterference the physical effect of super position of waves from two sources vibrating with same frequency and
properties of laserlasers have applications in various disciplines of science and technology they also find applications in industry medicine and
scientific principle behind a laserthe basic scientific principle behind a laser was first put forward by dr charles htowns in 1954 which later led
luminous flux and laserthe luminous flux of a light source is measured in the units of lumen lm lumen lm is the amount of light emitted per second
properties of lightthe wavefronts can be of different shapes depending on the size and shape of light source and the distance from it huygens
theory of lightnewton proposed corpuscular theory of light2 according to corpuscular theory light consists of a stream of tiny light and
the parachute on a race car that weighs 8750 n opens at the end of a quarter-mile run when the car is traveling 38 ms what net retarding force
what is magnetic moment of a bar magnet1 when a bar magnet of pole strength m and length 2l is suspended freely in airit always turns along the
measurement of lengthif the zeroth division of the head scale does not coincide with the index line the screw gauge has zero errorif the zeroth
distinguish between absolute permeability and relative permeability of a mediumabsolute permeability1 absolute permeability is the ability of the
isolated magnetic poles do not exist explaina 1 if a bar magnet is cut into smaller and smaller pieces eventually ending with the smallest
state inverse square law of magnetism a coulombs inverse law of magnetism states that the force of attraction or repulsion between two
magnetic susceptibility and ferromagnetic substancesmagnetic susceptibility the magnetic susceptibility c of a substance is defined as the
equatorial line and neutral pointequatorial line the imaginary line joining the centre of mass and perpendicular to the line joining the poles
two students walk in the same direction along a straight path at a constant speed one at 90ms and another at 190ms assuming that they start at the