Peoples Physics Book Version-3

26.1. Appendix A: Answers to Selected Problems (3e) http://www.ck12.org

2. Not allowed: lepton number not conserved


3. Not allowed: quark number not conserved


4. Allowed: electron neutrino annihilates with a positron becomes aW+then splits to muon and muon neutrino.


5. Allowed: up quark annihilates with anti-up quark becomesZ^0 , then becomes a strange quark and anti-strange
   quark


6. Not allowed: charge not conserved


7. Allowed: this is a very rare interaction


8. Not allowed: electrons don’t interact with gluons


9. Not allowed: neutrinos don’t interact with photons


10. Allowed: the electron and the positron are exchanging virtual electron/positron pairs


11. Allowed: this is beta decay, a down quark splits into an up quark an electron and an electron neutrino via a
    W−particle.


12. Allowed: a muon splits into an muon neutrino, an electron and an electron neutrino via aW−particle.

Ch 24: Quantum Mechanics

1. 
   
   
   
   1. 
      
      
      
      6. 752 × 10 −^26 J, 2. 253 × 10 −^34 kgm/s
      
      
      
      
   
   
   2. 
      
      
      
      5. 96 × 10 −^20 J, 1. 99 × 10 −^28 kgm/s
      
      
      
      
   
   
   3. 
      
      
      
      4. 90 × 10 −^28 J, 1. 63 × 10 −^36 kgm/s
      
      
      
      
   
   
   4. 1.94 eV, 1. 04 × 10 −^27 kgm/s
   
   
   5. 12.7 eV, 6. 76 × 10 −^27 kgm/s
   
   
   6. 5.00 eV, 2. 67 × 10 −^21 kgm/s
      1..0827 nm
   
   
   7. 
      
      
      
      4. 59 × 10 −^4 nm
         3..942 nm
      
      
      
      
   
   
   
   


2. 
   
   
   
   1. 03 × 10 −^20 m
   
   
   2. 36 nm
   
   
   3. no
   
   
   4. 380 nm,73 nm,36 nm,92 nm,39 nm
      3..80 V
      4..564 nm
      1..124 nm
      2..00120 nm
   
   
   
   


3. 24,600 m/s


4. 
   
   
   
   1. 84 × 108 m/s
      1..491 m/s
   
   
   2. 
      
      
      
      3. 14107 J
      
      
      
      
   
   
   3. 64 Mw
   
   
   4. 1.55 pm
   
   
   
   


5. 3.27 eV
   8..


6. b. 15 c. 182 nm,188 nm,206 nm,230 nm
   10.− 10 .3 eV,− 3 .82 eV,− 2 .29 eV,− 1 .83 eV


7. 
   
   
   
   4. 19 × 107 m/s
   
   
   
   


8. 
   
   
   
   1. 70 × 10 −^11 m