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low resistivity materials the conducting materials having resistivity between 10-8 to 10-6 ohm-m come under this category and are used in house
classification of conducting materialselectrical resistivity of a conducting material or conductor ranges from 10-8 to 10-3 ohm-m. a good conducting
mechanical stressing when a material undergoes a mechanical treatment its resistivity changes due to mechanical distortion of the crystal structures.
alloying when an impurity atom of a different size compared to the host atom is placed into the crystal lattice the impurity atom distorts the resin
temperaturewhen the conduction electrons are only scattered by thermal vibrations of thermal ions then tau in the mobility expression refers to the
resistivityresistance may be defined as that property of a substance which opposes or restricts the flow of current or electrons through it. the
classical free electron theorythe free electron theory of metals using classical laws was developed by dude and lorentz in the beginning of last
problem solving techniquethere are two approaches to solve a problem. they are-1. top down-a top down design approach starts by identifying
q. describes the construction of a nicol prism and explains its action in converting upl into ppl.sol. nicol prism this is the
it consists of two semis circular plates.one is of quartz and other is glass plate joined together along the diameter. the quartz semi circular plate
q. what is optical activity and optical rotation? write the laws of optical activity of optically active solution.optical activityif a plane
q. derive an expression for the intensity distribution due to fraunhofers diffraction at a single slit and shows that the intensity of the first
q. explain rayleighs criterion of just resolution of two spectral lines of equal intensities giving suitable intensity distribution carves. show
q. prove that for thin films the interference pattern in reflected and transmitted light are complementary to each other.also explain why the
q. describe the method of measurement of the thickness of a thin transparent mica slit using fresnels bi-prism. give necessary theory. draw
q. how will you measure thickness of thin silicon-chip using bi-prism experiment? derive the formula used.when a thin silicon chip thin film of
q. how shall you measure wavelength of light used in newtons ring experiment? derive the formula used. measurement of wavelength of monochromatic
q. what will be effect on newtons rings ifi a little oil micro 1.65 is introduced between the lens micro - 1.5 and the glass
q. what are antireflection films and interference filters? ans. anti reflecting films when a beam of light travels normally from a medium of
q. describe the construction and working of michelson interferometer. explain how you will determine the wavelength difference of two components
q. explain how newtons ring can be obtained in the laboratory. why newtons rings are circular in shape? how the newtons rings are used to find
q. in a newtons ring experiment the wavelength of the light used is 6 times 10-5 cm and the difference of square of diameters of successive rings are
q. what are the differences between fringes obtained in newtons ring experiment and those produced by a bi-prism. difference between bi-prism
q. explain with the help of diagram and experiment arrangement to produce newtons rings.
q. give the basic assumptions made in free electron model of solid.orwrite down basic postulates of sommerfields free electron gas model. show