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Second Year Physics Nuclear Physics


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21.20Howcanradioactivityheipinthetreatmentofcancer? 21.20 How can radioactivity heip in the treatment of cancer?

21.7 Explain how \alpha and \beta -particies may ionize an atom without directly hitting the electrons? What is the difference in the action of the two particles for producing ionization?
21.7 Explain how  \alpha  and  \beta -particies may ionize an atom without directly hitting the electrons? What is the difference in the action of the two particles for producing ionization?

21.7Explainhowαandβparticiesmayionizeanatomwithoutdirectlyhittingtheelectrons?Whatisthedifferenceintheactionofthetwoparticlesforproducingionization?21.7 Explain how \alpha and \beta -particies may ionize an atom without directly hitting the electrons? What is the difference in the action of the two particles for producing ionization?

18.11. What are two common radiation hazards? Briefly describe the precautions that are taken against them.
18.11. What are two common radiation hazards? Briefly describe the precautions that are taken against them.

18.11.Whataretwocommonradiationhazards?Brieflydescribetheprecautionsthataretakenagainstthem.18.11. What are two common radiation hazards? Briefly describe the precautions that are taken against them.

21.8 A sheet of lead 5.0 \mathrm{~mm} thick reduces the intensity of a beam of y -rays by a factor 0.4 . Find half value thickness of lead sheet which will reduce the intensity to half of its initial value.(Ans: 3.79 \mathrm{~mm} )
 21.8  A sheet of lead  5.0 \mathrm{~mm}  thick reduces the intensity of a beam of  y -rays by a factor  0.4 . Find half value thickness of lead sheet which will reduce the intensity to half of its initial value.(Ans:  3.79 \mathrm{~mm}  )

21.8Asheetoflead5.0 mmthickreducestheintensityofabeamofyraysbyafactor0.4.Findhalfvaluethicknessofleadsheetwhichwillreducetheintensitytohalfofitsinitialvalue.(Ans:3.79 mm) 21.8 A sheet of lead 5.0 \mathrm{~mm} thick reduces the intensity of a beam of y -rays by a factor 0.4 . Find half value thickness of lead sheet which will reduce the intensity to half of its initial value.(Ans: 3.79 \mathrm{~mm} )

21.1 Find the mass defect and the binding energy for tritium if the atomic mass of tritium is 3.016049 \mathrm{u} .(Ans: 0.00857 \mathrm{u} 7.97 \mathrm{MeV} )
 21.1 Find the mass defect and the binding energy for tritium if the atomic mass of tritium is  3.016049 \mathrm{u} .(Ans:  0.00857 \mathrm{u} 7.97 \mathrm{MeV}  )

21.1Findthemassdefectandthebindingenergyfortritiumiftheatomicmassoftritiumis3.016049u.(Ans:0.00857u7.97MeV) 21.1 Find the mass defect and the binding energy for tritium if the atomic mass of tritium is 3.016049 \mathrm{u} .(Ans: 0.00857 \mathrm{u} 7.97 \mathrm{MeV} )

21.20 How can radioactivity heip in the treatment of cancer?
 21.20  How can radioactivity heip in the treatment of cancer?
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21.20Howcanradioactivityheipinthetreatmentofcancer? 21.20 How can radioactivity heip in the treatment of cancer?

21.8 A particle which produces more ionization is less penetrating. Why?
 21.8 A particle which produces more ionization is less penetrating. Why?

21.8Aparticlewhichproducesmoreionizationislesspenetrating.Why? 21.8 A particle which produces more ionization is less penetrating. Why?

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