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q the half life of radon is 38 days calculate mean lifehalf life period hlp tfrac12 06931 lambda 06931
q what is pair production and pair annihilationpair productionthe conversion of a photon in to an electron-positron pair on its interaction with the
q what percentage of a given radioactive substance will be left after 5 half -life periods the residual part of radioactive substance frac12
q what is the use of control rods mention any two control rodsthe control rods are utilized to control the chain reaction they are extremely good
q define roentgen and activity and curieone roentgen 1r is described as the quantity of radiation which produces 16 times 1012 pairs of ions in 1
q what is artificial radioactivitythe phenomenon by which still light elements are made radioactive by artificial or induced methods is called
q state any three properties of the nuclear forces i a nuclear force is charge independentii a nuclear force is the strongest recognized force in
q what are nuclear forces the force which conquers the electrostatic repulsion between positively charged protons and binds the protons and neutrons
q write any three findings of binding energy curve i the binding energy per nucleon arrive at a maximum of 88 mev at a 56 corresponding to the iron
q define binding energy the energy equal of mass defect is called as binding energythere4 binding energy zmp nmn - m c2 deltam c2 here deltam is
q define 1 amuone atomic mass unit is thinks as one twelfth of the mass of carbon atom 6 c 121 amu 166 x 10 -27 kgq define mass defectthe
q tritium has a half life period of 125 years what fraction of the sample will be left over after 25 years hlp 125 yearsnumber of hlps in 25 years
q in 17 cl 35 compute the number of protons neutrons and electronsnumber of electrons 17 number of protons 17 number of neutrons
q select the pairs of isotopes isobars and isotones from the following nuclei11 na 22 12 mg 24 11 na 24 10 ne 23 isotopes are 11 na 22 11 na
q the kinetic energy of an electron 120 ev compute the de broglie wavelength of electronlambda h radic2me lambda 6626 x 10-34 radic 2 x 91 x 10
q according to classical mechanics what is the concept of time as-per to classical mechanicsi the time interval among two events has the same value
q state the fundamental postulates of special theory of relativitythe two basic postulates of the special theory of relativity arei the laws of
q the work function of a metal surface is 18 ev compute the threshold wavelength work function w hgammao h c lambda 0lambda 0 h c w 6626 x
q what is a frame of reference a system of co-ordinate axes which describe the position of a particle in two or three dimensional space is called a
q what are the limitations of electron microscopean electron microscope is operated merely in high vacuum this prohibits the utilize of the
q why x-rays are not used in microscopes 1 the wavelength of x-rays is slighter than that of the visible light2 x-rays cant be focussed as visible
q what are the uses of an electron microscopeuses of electron microscope i it is utilized in the industry to study the surface of metals structure of
q an electron beam is accelerated through a potential difference of 104 volt find the de broglie wavelength lambda 1227 a o radicvlambda 1227 a o
q what are de broglie waves matter in motion should be accompanied by waves called de broglie wavesde broglie wavelength lambda h
q give three applications of photoelectric cells i photoelectric cells are utilized for reproducing sound in cinematographyii they are utilized for