563489578934

746
Answers to Selected Problems
h fe R s
8–17 G a =
h oe (R s + h ie ) 2
8–21 (a) 129 K (b) -76.6 dBm
8–23 3.2 * 10 -7
8–26 (a) 19.8 dB (b) 7.52 dB (c) 4.67 dB
8–30 (a) 1598 K (b) 7.75 dB (c) 0.022 W
See MATLAB file P8_30.m
8–32 54%, 74.4%
8–36 (a) 42 dB/K (b) 42 dB/K (c) 42 dB/K
See MATLAB file P8_36.m
8–38 12.84 m diameter
8–42 At 2 miles: (a) -49.7 dBm (b) -58.7 dBm (c) -67.8 dBm
8–46 20.6 kW
8–49 See Student Solutions Manual
Appendix B
B–1 0.3486
B–2 (a) 5/36 (b) 15/ 36
B–4 1/2
B–5 1/ 3
B–9 0.4375
B–12 (a) b (b) 1/b (c) 1/b 2
B–17 See MATLAB file PB_17.m
B–23 51.0
B–30 (a) 1.337 * 10 -11 (b) 0.9520
B–34
1
2s12py ce-A1y+ mB 2 >(2s 2 ) + e
-A1y - mB 2 >(2s 2 ) d,
f(y) = d
y Ú 0,
t
0, y 6 0
B–38 See MATLAB file PB_38.m
B–40 Bs> 12p
B–42 (a) 1/6 (b) Yes (c) 1/12
12
(d) f(x 2 ƒ x 1 ) = b
(1 + x 2), 0 … x 1 … 1, 0 … x 2 … 4
r
0, otherwise
B–45 See MATLAB file PB_45.m
B–52 See MATLAB file PB_52.m
1
q
1
B–54 (a) f y (y) =
f x a y , xb dx (b) f y (y) =
ƒ Ax ƒ Ax 3 ƒ Ax ƒ
q
1
3 -q
- q
f x1 a y
Ax b f x 2
(x) dx