Elements of Modern Physics
426
21. E =
(
)/(
)
4
y
y
y
y
Ne g B e
e
e
e y
m
−
−
−
+
= 4
e g B
mkT
22. 3T
Chapter 9
2. ∆E ≈ 0.72 A
2/3
MeV
3. 0.32
6. 4.79 /2 p
e m
for l = 2
7. s 1/2 , p 1/2 , s 1/2 , h 9/2 ; – 1.91, – 0.26, 2.79, 2.62 in units of /2 p
e m
8. 3.9 × 10
–54
kg. m
2
, I tot = 8.7 × 10
–54
kg. m
2
,
E = 0.336 Mev
9. 0.033 MeV and 0.076 MeV
10. Ru
Rh
Pd, Ag
Pd, Cd
Ag;
+
+
β
β
β
β
 →
 →
 →
 →
Ag and Cd decay also by election capture.
11. Ni
Cu, Zn
Cu by electron capture
β
 →
 →
12. 27.9 MeV, 4.23 MeV, 0.07 MeV
13. 8.36 Mev, 0.076 Mev
14. 31. 9739 mu
15. 5.5 × 10
–5
MeV, 4.6 × 10
–22
kg m/s
16. 8; 6; 1.54 × 10
–10
gm; 1.45 × 10
9
years
17. 2.05 MeV
18. 1.93 × 10
–26
m
2
19. 53 g
20. Fusion would require 4.6% change and fission 30% change in 5 × 10
9
years
Chapter 10
2. hv =
2 1/2
2
2 1/2
2 1/2
(
)
(
)
(
) c o s
E mc
mc E mc
E mc
+
+
− −
θ
3. (m K
2
–3mπ
2
)/2m K
4. Σ
0
→ Λ0 + γ decay is due to electromagnetic interaction, whereas the
decay of Σ
±
is due to weak interaction
5. About 2 × 10
–18
m
6. 4 × 10
3
s
7. 0.82 Wb/m
2