Conceptual Physics

Chapter 29 Answers 749

Chapter Assumptions

Unless stated otherwise, use 5.00×10–5 T for the strength of the Earth's magnetic field at its surface.

Elementary charge, e = 1.60×10–19 C

Answers to selected problems

C.1 No
Answers vary

C.4 Counterclockwise
Answers vary

C.7 (a) Counterclockwise
(b) Clockwise
(c) Answers vary

C.9 (a) The same direction
Answers vary
(b) Answers vary

0.1 (a) No
(b) Yes
(c) Yes

2.1 (a) Yes
(b) The induced emf increases when the wire moves faster.
(c) The induced emf increases when the field strength increases.
(d) Answers vary

5.1 0.500 m
5.3 0.808 V
6.1 4.25 Wb
7.1 12.9 T· m2
7.3 1.13eí6 A
8.1 8.00 ms
11.1 (a) The emf is a maximum when the velocity vector is Perpendicular to the magnetic field.

(b) The emf is zero when the velocity vector is Parallel to the magnetic field.
(c) Yes
(d) Yes
12.1 0.021 s
13.1 (a) 0.2 A
(b) 2.0 V
(c) 1.0e6 Hz
15.1 1.50e+3 turns
15.3 26.2
15.5 (a) 7.75e3 for 100,000 V
1.74e4 for 225,000 V
2.67e4 for 345,000 V
(b) 900 A for 100,000 V
400 A for 225,000 V
261 A for 345,000 V
(c) 9.07e7 W for 100,000 V
1.79e7 W for 225,000 V
7.63e6 W for 345,000 V
(d) Answers vary
17.1 20 V

Copyright 2000-2007 Kinetic Books Co. Chapter 29 Answers

Chapter 30 Answers

Chapter Assumptions

Unless stated otherwise, electromagnetic waves are assumed to be propagating as plane waves through a vacuum.
When converting light-years to meters, assume that a year has 365 days.
The speed of light in a vacuum is 3.00×108 m/s.
The Sun radiates energy at the rate of 3.91×1026 W.

Answers to selected problems

C.1 AM
Answers vary

C.4 (a) Northísouth
(b) Vertical

C.6 (a) Vertical
(b) Vertical

1.1 (a) 1.28 lightíseconds
(b) 8.34 lightíminutes
(c) 2.6e20 m

1.3 (a) 7.5e5 Hz
(b) AM

1.5 (a) 12.2 cm
(b) 6.10 cm
(c) Yes

1.7 (a) (0, 0, 0)
(b) (255, 255, 255)
(c) 16777216 colors

1.9 (a) 19%
(b) 57%
(c) 16%

2.1 Away from you
3.1 1.39eí6 T

750 Copyright 2000-2007 Kinetic Books Co. Chapter 30 Answers

Chapter 31 Answers

Answers to selected problems

C.2 Virtual
Larger
Upright

C.4 Real
Smaller
Inverted

C.6 (a) Larger 751
(b) Inverts
Becomes real

0.1 (a) To the left of C
In between C and F
(b) To the left of C
(c) In between C and F
To the right of F

3.1 7.50 m
5.1 (a) 1.19 m

(b) 53.5°
(c) 180°
5.3 22
5.5 1.56 m
9.1 -1.15 cm
9.3 10.5 cm
14.1 (a) No
(b) No
(c) No
(d) No
15.1 (a) +15.2 cm
(b) í0.879
(c) Inverted
15.3 16.5 cm
15.5 (a) 12.5 cm
(b) 8.33 cm
15.7 63.3 cm
15.9 (a) Concave
(b) 6.20 cm
15.11 í34.0 cm
17.1 6.16 cm

Copyright 2000-2007 Kinetic Books Co. Chapter 31 Answers

Chapter 32 Answers

Chapter Assumptions

Unless stated otherwise, the incident medium is air, with an index of refraction of 1.00.

Answers to selected problems

0.1 (a) Air
(b) Toward

2.1 Diamond
2.3 1.86e8 m/s
3.1 12.0°
3.3 1.27
3.5 1.63
3.7 1.71
7.1 (a) 65.8°

(b) 34.8°
8.1 24.4°
8.3 1.54
9.1 0.11°

752 Copyright 2000-2007 Kinetic Books Co. Chapter 32 Answers

Chapter 33 Answers
Answers to selected problems

C.1 Real; larger; inverted

C.3 Virtual; smaller; upright

C.5 Inverted 753
Answers vary

0.1 (a) Between the focal point and the lens.
(b) On the opposite side of the focal point as the lens.
(c) Between the focal point and the lens.

4.1 (a) No
(b) No
(c) No

7.1 (a) Positive
(b) Positive
(c) 4.11 cm
(d) Converging

7.3 0.135 m
7.5 (a) Negative

(b) Real
(c) 14.0 cm
(d) 4.67 cm
7.7 50.0 cm
7.9 (a) Diverging
(b) í3.94 cm
7.11 0.0233 m
7.13 1.18 m
8.1 (a) 10.0 cm
(b) 6.00 cm
10.1 (a) Diverging
(b) í40.0 cm
13.1 0.0066 radians
13.3 1.40e5 m

Copyright 2000-2007 Kinetic Books Co. Chapter 33 Answers

Chapter 34 Answers
Answers to selected problems
C.1 Ȝ/2

C.2 No
Answers vary

3.1 606eí9 m
3.3 68 fringes

754 Copyright 2000-2007 Kinetic Books Co. Chapter 34 Answers

Chapter 35 Answers

Chapter Assumptions

Assume the speed of light in a vacuum is 3.00×108 m/s for all observers.

Answers to selected problems

C.1 No
C.2 No
C.4 V/2
3.1 (a) 9.0 s

(b) 8.5 s
5.1 (a) Yes

(b) Yes
(c) Yes
(d) No
6.1 (a) 3.00eí7 s
(b) 3.25eí7 s
6.3 1.55e+8 m/s
6.5 2.89e+8 m/s
7.1 (a) 555 m
(b) 745 m
(c) 1.85eí6 s
(d) 2.48eí6 s
(e) 1.34
(f) 2.48eí6 s
8.1 (a) 6.0eí8 s
(b) 1.0eí7 s
(c) Shorter
9.1 (a) 0.333c
(b) 65.0 m
10.2 (a) 1.20 s
(b) 1.27 s
(c) 1.69 s
10.4 0.111c
12.1 (a) 0.875c
(b) 1700 MeV/c
12.3 1.32 MeV
12.5 (a) 0.163 km
(b) 1.46e+13 years
12.7 5.9e4

Copyright 2000-2007 Kinetic Books Co. Chapter 35 Answers 755

Chapter 36 Answers

Chapter Assumptions

When converting between electron-volts and joules, assume that
1 eV = 1.60×10–19 J

Answers to selected problems

C.3 (a) There are more electrons leaving the surface.
(b) The electrons' maximum kinetic energy is still equal to E0.

C.4 There is movement of holes in the valence band.
C.7 (a) Positive

(a) Negative
C.9 Yes

Answers vary
2.1 486 nm
3.1 4.2e14 Hz up to 7.5e14 Hz
3.3 1000000
5.1 4.74 eV
5.3 12 nm
8.1 shorter wavelength: 122 nm

longer wavelength: 658 nm
11.1 1.11eí6 m
14.1 2.4 eV

756 Copyright 2000-2007 Kinetic Books Co. Chapter 36 Answers

Chapter 37 Answers

Chapter Assumptions

1 eV = 1.60×10–19 J

h = 6.63×10–34 J·s

ƫ = 1.05×10–34 J·s

mec2 = 0.511 MeV

Answers to selected problems

C.1 Electron A
Answers vary

C.3 Becomes smaller
Answers vary

1.1 1.19eí27 kg·m/s
2.1 2.01eí38 m
2.3 1.67Eí27 kg
2.5 120 V
3.1 (a) 1.41eí10 m

(b) 2.80e3 m/s
6.1 (a) 5.0eí6 m

(b) 1.1Eí29 kg·m/s
6.3 (a) 3.3eí20 m

(b) No

Copyright 2000-2007 Kinetic Books Co. Chapter 37 Answers 757

Chapter 38 Answers

Answers to selected problems

C.1 A small fraction were deflected from the gold foil.
C.3 (a) 12C and 14C

14O and 16O
(b) 12C and 14O
14C and 16O
(c) 12C and 14C
14O and 16O
C.5 Electric (Coulomb) attraction
C.7 No
Answers vary
C.9 Nuclear fusion
3.1 19 electrons
3.3 (a) 40 is the mass number
(b) 20 protons
(c) 20 neutrons
(d) 18 electrons
6.1 64
7.1 1.8e2 m
8.1 206
9.1 4.54eí12 J
13.1 2.96eí11 J
14.1 (a) 4 hydrogen atoms
(b) 4.62eí29 kg
15.1 (a) Decrease
(b) 1.3eí29 kg
15.3 One alpha and two negative beta particle(s)
15.5 Leadí206
17.1 6.25 percent
18.1 5730 years

758 Copyright 2000-2007 Kinetic Books Co. Chapter 38 Answers