1248_Physics ProblemsTechnical Physics

1248_Physics ProblemsTechnical Physics - 589 Chapter 44 (c)...

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Chapter 44 589 (c) From (a), intercept == ln . cpm bg 0 830. Thus, cpm counts min counts min 0 830 3 402 10 × e . . . (d) N R 0 00 3 31 6 1 417 10 0100 965 10 = × × −− λλ cpm Eff counts min min atoms ej a f . .. . P44.63 (a) The reaction is 61 145 Pm Pr 59 141 →+ α (b) QM M M =− = = Pm Pr MeV b g 931 5 144 912 744 4 002 603 140 907 648 931 5 2 32 . . . . (c) The alpha and daughter have equal and opposite momenta pp d = E p m = 2 2 E p m d d d = 2 2 E E E EE pm m mm m d d d d d αα tot = + = + = + = + = + = 2 22 2 12 141 141 4 97 2% . o r 2.26 MeV. This is carried away by the alpha. P44.64 (a) If E is the energy difference between the excited and ground states of the nucleus of mass M , and hf is the energy of the emitted photon, conservation of energy for the nucleus- photon system gives Eh fE r =+ . (1) Where E r is the recoil energy of the nucleus, which can be expressed as
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