bei48482_FM

524 Appendix

permitting deuterons to react despite having insufficient energy to come together

classically.

CHAPTER 13

1. 
   

   (a) 3.22 10 ^22 s. (b) The strong electric field of the nucleus separates the
   electron and positron sufficiently so that they cannot recombine afterward to
   reconstitute the photon.

   
   


2. 
   

   74.5 MeV.

   
   


3. 
   

   60°. (Hint:Use the relativistic expression for KE to find p.)

   
   


4. 
   

   (a) B not conserved. (b) Can occur. (c) Charge not conserved. (d) Can occur.

   
   


5. 
   

   Conservation of energy.

   
   


6. 
   

   (^) (mu-neutrino).

   
   


7. 
   

   A negative xi particle, Ξ.

   
   


8. 
   

   In order to obey the exclusion principle; no.

   
   


9. 
   

   e.

   
   


10. 
    

    Σ^.

    
    


11. 
    

    Only the strong interaction can produce such rapid decays.

    
    


12. 
    

    Since a positron and a neutrino are emitted, the weak interaction is involved.
    Because this is so much feebler than the strong interaction, the reaction has a
    low probability even when the protons are energetic enough to overcome the
    Coulomb barrier.

    
    


13. 
    

    (a) If ris the radius of the balloon, dsdt(1r)(drdt)swhere rand drdtare
    the same for all points on the balloon at any time. (b) H(1r)(drdt). If dr/dt
    is proportional to r, His constant, otherwise not.

    
    

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