, S ince defining this course 30 years ago, Paul
Hewitt's best-selling text continues as the bench-
mark by which all others are judged. In Conceptual
Physics with MasteringPhysics®, Twelfth Edition,
Paul Hewitt integrates a compelling text and the
A Conceptual Approach most advanced media to make physics interesting,
understandable, and relevant for non-science majors.
to Physics—Now with The Twelfth Edition will delight students with infor-
mative and fun Hewitt-Drew-It screencasts, updated
content, applications, and new learning activities in
MasteringPhysics ! ® MasteringPhysics.
490 PA
pa R
rTt six Light
different wavelengths—waves of low frequencies have long wavelengths, and waves
NEW! A new interior design ▶ Red of high frequencies have short wavelengths. For example, since the speed of the wave
is 300,000 km/s, an electric charge oscillating once per second (1 Hz) will produce
provides an attractive, fresh, and a wave with a wavelength of 300,000 km. This is because only one wavelength
Green
accessible new look, updating a is generated in 1 second. If the frequency of oscillation were 10 Hz, then 10 wave-
wave
lengths would be formed in 1 second, and the corresponding wavelength would be
classic text to be even more student Violet 30,000 km. A frequency of 10,000 Hz would produce a wavelength of 30 km. So,
friendly. Figure 26.5
the higher the frequency of the vibrating charge, the shorter the wavelength of radiant
energy.3
INTERACTIVE FIGURE
We tend to think of space as empty, but only because we cannot see the mon- mon
Relative wavelengths of red, green, tages of electromagnetic waves that permeate every part of our surroundings. We
and violet light. Violet light has
nearly twice the frequency of red
see some of these waves, of course, as light. These waves constitute only a micro-
micro
light and half the wavelength. portion of the electromagnetic spectrum. We are unconscious of radio and cell- cell
phone waves, which engulf us every moment. Free electrons in every piece of metal
on Earth’s surface continuously dance to the rhythms of these waves. They jiggle
in unison with the electrons being driven up and down along their transmitting
antennae. A radio or television receiver is simply a device that sorts and amplifies
these tiny currents. There is radiation everywhere. Our first impression of the uni-
uni
verse is one of matter and void, but actually the universe is a dense sea of radiation
occupied only occasionally by specks of matter.
NEW! Over 200 QR codes ▶ CheCk Point
throughout the book allow students to Are we correct to say that a radio wave is a low-frequency light wave? And
that a radio wave is also a sound wave?
use a mobile device to instantly watch SCreenCASt: speed of Light
Paul Hewitt’s video demonstrations CheCk Your Answers
and Hewitt-Drew-It screencasts to Yes and no. Both a radio wave and a light wave are electromagnetic waves emit-
ted by vibrating electrons; radio waves have lower frequencies than light waves,
prepare for lecture and gain a better so a radio wave may be considered to be a low-frequency light wave (and a light
conceptual understanding of physics. wave, similarly, may be considered to be a high-frequency radio wave). But a
sound wave is a mechanical vibration of matter and is fundamentally different
from an electromagnetic wave. so a radio wave is definitely not a sound wave.
Fractal antennas
F
or quality reception of electromagnetic waves, a whole. In any fractal, similar
NEW! Updated applications are ▶ conventional antenna has to be about one-quarter
onequarter
wavelength long. That’s why, in early mobile devices,
shapes appear at all levels of
magnification. Common
available for digital technology, antennas had to be pulled out before the device was used. fractals in nature include
Nathan Cohen, a professor at Boston University, was snowflakes, clouds, lightning
environment, and energy. These topics troubled by a rule in Boston at the time that prohibited bolts, shorelines, and even
are at the forefront of everyone’s the use of large external antennas on buildings. So he cauliflower and broccoli.
fashioned a small antenna by folding aluminum foil into The fractal antenna, like other fractals, has a shape that
consciousness these days and an a compact fractal shape (a Van Koch figure—check frac- repeats itself. Because of its folded self-similar
selfsimilar design, a
intelligent awareness of their scientific tals on the Internet). It worked. He then engineered and fractal antenna can be compressed and fit into the body
patented many practical fractal antennas, as did Carles of the device—it can also simultaneously operate at differ-
differ
foundations will give rise to better Puente,
Fuente, an inventor in Spain. Both formed fractalantenna
fractal-antenna ent frequencies. Hence the same antenna can be used for
companies. mobilephone conversations and for GPS navigation.
mobile-phone
decision making in the political arena. Fractals are fascinating shapes that can be split into parts, How nice that these devices fit in your pocket. Cheers
each of which is (or approximates) a reduced copy of the for compact fractal antennas!
3
The relationship is c 5 f l, where c is the wave speed (constant), f is the frequency, and l is the wavelength.
M26_HEWI9107_12_CH26_pp485-503.indd 490 10/21/13 2:53
10/24/13 3:10 PM
, Outstanding Content T he Mastering system provides
tutorials and coaching activities
covering content relevant to the con-
Accompanied by ceptual physics course and motivates
students to learn outside of class and
Unparalleled Tutoring arrive prepared for lecture.
Video Activities
▶ Video Activities ask students
to answer multiple-choice
questions based on the content
of Paul Hewitt’s popular
classroom demonstrations.
▶ NEW! More automatically
graded Mastering content
essay-style end-of-chapter
questions have been rewritten
as multiple choice.
Hint
Feedback and hints coach
students back onto
the right track, emulating
how an instructor works
with students during an
Feedback office-hour visit
Interactive Figure Activities
Interactive Figure Activities ▶
help students master important
topics by interacting with key
figures, bringing principles to
life. Hints and specific wrong
answer feedback help guide
students toward understanding
the scientific principles.
, S urvey data show that the
immediate feedback and tutorial
assistance in MasteringPhysics
motivate students to do more home- www.masteringphysics.com
work. The result is that students learn
more and improve their test scores.
Tutorials
▶ Assignable, in-depth tutorials guide
students through the toughest topics
with individualized coaching. These
self-paced tutorials coach students
with hints and feedback specific to
individual misconceptions. Tutorials
respond to a wide variety of typical
wrong answers that students might
enter at any step.
Coaching Activity
Coaching Activities ▶
have students interact
with content, and
available hints and/or
feedback promote
comprehension of
the concepts.
Hewitt's best-selling text continues as the bench-
mark by which all others are judged. In Conceptual
Physics with MasteringPhysics®, Twelfth Edition,
Paul Hewitt integrates a compelling text and the
A Conceptual Approach most advanced media to make physics interesting,
understandable, and relevant for non-science majors.
to Physics—Now with The Twelfth Edition will delight students with infor-
mative and fun Hewitt-Drew-It screencasts, updated
content, applications, and new learning activities in
MasteringPhysics ! ® MasteringPhysics.
490 PA
pa R
rTt six Light
different wavelengths—waves of low frequencies have long wavelengths, and waves
NEW! A new interior design ▶ Red of high frequencies have short wavelengths. For example, since the speed of the wave
is 300,000 km/s, an electric charge oscillating once per second (1 Hz) will produce
provides an attractive, fresh, and a wave with a wavelength of 300,000 km. This is because only one wavelength
Green
accessible new look, updating a is generated in 1 second. If the frequency of oscillation were 10 Hz, then 10 wave-
wave
lengths would be formed in 1 second, and the corresponding wavelength would be
classic text to be even more student Violet 30,000 km. A frequency of 10,000 Hz would produce a wavelength of 30 km. So,
friendly. Figure 26.5
the higher the frequency of the vibrating charge, the shorter the wavelength of radiant
energy.3
INTERACTIVE FIGURE
We tend to think of space as empty, but only because we cannot see the mon- mon
Relative wavelengths of red, green, tages of electromagnetic waves that permeate every part of our surroundings. We
and violet light. Violet light has
nearly twice the frequency of red
see some of these waves, of course, as light. These waves constitute only a micro-
micro
light and half the wavelength. portion of the electromagnetic spectrum. We are unconscious of radio and cell- cell
phone waves, which engulf us every moment. Free electrons in every piece of metal
on Earth’s surface continuously dance to the rhythms of these waves. They jiggle
in unison with the electrons being driven up and down along their transmitting
antennae. A radio or television receiver is simply a device that sorts and amplifies
these tiny currents. There is radiation everywhere. Our first impression of the uni-
uni
verse is one of matter and void, but actually the universe is a dense sea of radiation
occupied only occasionally by specks of matter.
NEW! Over 200 QR codes ▶ CheCk Point
throughout the book allow students to Are we correct to say that a radio wave is a low-frequency light wave? And
that a radio wave is also a sound wave?
use a mobile device to instantly watch SCreenCASt: speed of Light
Paul Hewitt’s video demonstrations CheCk Your Answers
and Hewitt-Drew-It screencasts to Yes and no. Both a radio wave and a light wave are electromagnetic waves emit-
ted by vibrating electrons; radio waves have lower frequencies than light waves,
prepare for lecture and gain a better so a radio wave may be considered to be a low-frequency light wave (and a light
conceptual understanding of physics. wave, similarly, may be considered to be a high-frequency radio wave). But a
sound wave is a mechanical vibration of matter and is fundamentally different
from an electromagnetic wave. so a radio wave is definitely not a sound wave.
Fractal antennas
F
or quality reception of electromagnetic waves, a whole. In any fractal, similar
NEW! Updated applications are ▶ conventional antenna has to be about one-quarter
onequarter
wavelength long. That’s why, in early mobile devices,
shapes appear at all levels of
magnification. Common
available for digital technology, antennas had to be pulled out before the device was used. fractals in nature include
Nathan Cohen, a professor at Boston University, was snowflakes, clouds, lightning
environment, and energy. These topics troubled by a rule in Boston at the time that prohibited bolts, shorelines, and even
are at the forefront of everyone’s the use of large external antennas on buildings. So he cauliflower and broccoli.
fashioned a small antenna by folding aluminum foil into The fractal antenna, like other fractals, has a shape that
consciousness these days and an a compact fractal shape (a Van Koch figure—check frac- repeats itself. Because of its folded self-similar
selfsimilar design, a
intelligent awareness of their scientific tals on the Internet). It worked. He then engineered and fractal antenna can be compressed and fit into the body
patented many practical fractal antennas, as did Carles of the device—it can also simultaneously operate at differ-
differ
foundations will give rise to better Puente,
Fuente, an inventor in Spain. Both formed fractalantenna
fractal-antenna ent frequencies. Hence the same antenna can be used for
companies. mobilephone conversations and for GPS navigation.
mobile-phone
decision making in the political arena. Fractals are fascinating shapes that can be split into parts, How nice that these devices fit in your pocket. Cheers
each of which is (or approximates) a reduced copy of the for compact fractal antennas!
3
The relationship is c 5 f l, where c is the wave speed (constant), f is the frequency, and l is the wavelength.
M26_HEWI9107_12_CH26_pp485-503.indd 490 10/21/13 2:53
10/24/13 3:10 PM
, Outstanding Content T he Mastering system provides
tutorials and coaching activities
covering content relevant to the con-
Accompanied by ceptual physics course and motivates
students to learn outside of class and
Unparalleled Tutoring arrive prepared for lecture.
Video Activities
▶ Video Activities ask students
to answer multiple-choice
questions based on the content
of Paul Hewitt’s popular
classroom demonstrations.
▶ NEW! More automatically
graded Mastering content
essay-style end-of-chapter
questions have been rewritten
as multiple choice.
Hint
Feedback and hints coach
students back onto
the right track, emulating
how an instructor works
with students during an
Feedback office-hour visit
Interactive Figure Activities
Interactive Figure Activities ▶
help students master important
topics by interacting with key
figures, bringing principles to
life. Hints and specific wrong
answer feedback help guide
students toward understanding
the scientific principles.
, S urvey data show that the
immediate feedback and tutorial
assistance in MasteringPhysics
motivate students to do more home- www.masteringphysics.com
work. The result is that students learn
more and improve their test scores.
Tutorials
▶ Assignable, in-depth tutorials guide
students through the toughest topics
with individualized coaching. These
self-paced tutorials coach students
with hints and feedback specific to
individual misconceptions. Tutorials
respond to a wide variety of typical
wrong answers that students might
enter at any step.
Coaching Activity
Coaching Activities ▶
have students interact
with content, and
available hints and/or
feedback promote
comprehension of
the concepts.
