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q calculate the longest wavelength that can be analysed by a rock salt crystal of spacing d 282 ao in the first orderdata d 282 aring 282 times
q what is the principle of millikans oil drop methodprinciple this method is foundation on the study of the motion of uncharged oil drop under free
q an x-ray diffraction of a crystal gave a closest line at an angle of 6o27 if the wavelength of x-ray is 058ao find the distance between the two
q what are the conditions to achieve the laser actionconditions to achieve laser action i there should be an inverted population that is more atoms
q what are coherent sources two sources are alleged to be coherent if they emit light waves of the same wave length and start with same phase or have
q define grating elementthe combined width of a slit as well as a ruling in a plane diffraction grating is called as a grating
q what are electromagnetic waves as-per to maxwell a speed up charge is a source of electromagnetic radiation in an electromagnetic wave electric as
q what are uses of ultra-violet radiations uses of ultra-violet radiations i they are utilized to destroy the bacteria and for sterilizing surgical
q in youngs double slit experiment the distance between the slits is 19 mm the distance between the slit and the screen is 1 m if the bandwidth is
q what are the uses of raman spectrum i it is widely utilized in almost all branches of scienceii raman spectra of dissimilar substances enable to
q what is raman shift in 1928 sir cv raman fined out experimentally that the monochromatic light is scattered when it is allowed to pass through a
q state brewsters lawbrewsters law the digression of the polarising angle is numerically equal to the refractive index of the mediumthat is tan ip
q what is fluorescencewhen an atomic or else molecular system is excited into higher energy state by absorption of energy it returns back to lower
q what is fraunhofer diffractiona the source as well as the screen are at infinite distances from the obstacle producing diffractionb the wave front
q what is fresnel diffractiona the source as well as the screen are at finite distances from the obstacle producing diffractionb the wave front
q a plano-convex lens of radius 3 m is placed on a flat glass plate and is illuminated by monochromatic light the radius of the 8th dark ring is 36
q the refractive index of a medium is radic3 compute the angle of refraction if the un-polarised light is incident on it at the polarizing angle of
q why the centre of newtons rings pattern appears darkthe thickness of the air film becomes zero at the point of contact of lens l with glass plate p
q a light of wavelength 58900a falls normally on a thin air film 6 dark fringes are seen between two points calculate the thickness of the film 2mut
q distinguish between interference and diffraction fringesinterference diffraction 1 it is because of the superposition of secondary wavelets from
q state huygens principlehuygens principlea every point on a specified wave front may be considered as a source of secondary wavelets which spread
q on what factors does the amount of optical rotation dependthe amount of optical rotation relay ona thickness of crystalb density of the crystal or
q state the conditions to achieve total internal reflection for entire internal reflection to take placea light should travel from a denser medium to
q state any three uses of ir rays a infrared lamps are utilized in physiotherapyb infrared photographs are utilized in weather forecastingc as
q two slits 03 mm separately are illuminated by light of wavelength 4500 0a the screen is placed at a distance 1m from the slits find the separation