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radio active seriesthere are three radio active series depending on their progenitorthey arei uranium series called 2n2 seriesii actino-uranium
radiography and depletion of ozone layerwhat is radiography a the method in which soft x-rays are used in medical diagnosis is called
infrared radiations and ultra violet radiationswhat are infrared radiations and ultra violet radiationsans infraredwavelengths larger than visible
electromagnetic radiationswhat are the common features among all the electromagnetic radiationsans 1 they all can be described in terms of
radio waves and microwaveswhat are microwaves and radio wavesans microwaves1 the wavelength ranges from 10mum to10m2 commonly produced by
spectrum and electromagnetic radiationswhat is a spectrumans a spectrum is a group of wave lengths or frequencieswhat are the electromagnetic
dispersion and impure spectrumdispersion the phenomenon due to which a polychromatic light splits into component colours when passed through a
uses of radio isotopes used inimedicineii industryiii agricultureiv meteorology andv radio active
lanthanoids with 4 os act as strong oxidising agents even though it is in stable configuration f
uv radiations and x - rays areuv radiations are produced by the high energy transitions of the electrons in atoms uv radiations have
microwaves and radio wavesmicrowaves are produced by high frequency electromagnetic oscillators in electric circuits microwaves are
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