Transcript EM Spectrum EM Waves

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PHY101
Chapter 8 Review
Study of EM Waves
Cheryl Dellai
Study of EM Waves
Magnetism
Interactions
EM Waves
EM
Spectrum
Atmosphere
Potpourri
$100
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$100
$100
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$100
$200
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$300
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$400
Magnetism
$100
Like poles (repel/attract).
ANSWER
Magnetism
$200
Magnetic field of the Earth on
average.
ANSWER
Magnetism
$300
Magnetic field at Phoenix.
ANSWER
Magnetism
$400
What is the magnetic field
force equation?
ANSWER
Interactions
$100
What can change in the
magnetic flux?
ANSWER
Interactions
$200
What is Faraday's Law?
ANSWER
Interactions
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What is Ampere-Maxwell's
Law?
ANSWER
Interactions
$400
What is Lenz’s Law?
ANSWER
EM Waves
$100
How are EM waves created?
ANSWER
EM Waves
$200
A radio transmitter broadcasts at
a frequency of 200,000 Hz.
What is the wavelength of the
wave?
ANSWER
EM Waves
$300
What is the wavelength of the peak
of the blackbody radiation curve for
something at 3,000 K—the
temperature of the filament of a light
bulb?
What type of EM wave is this?
ANSWER
EM Waves
$400
About how hot does something
have to get to glow red hot?
ANSWER
EM Spectrum
$100
The cosmic background
radiation has _____.
ANSWER
EM Spectrum
$200
The main form of radiation
that our bodies emit is
__________.
ANSWER
EM Spectrum
$300
__________ radiation is emitted
from a small hole in a furnace.
ANSWER
EM Spectrum
$400
The total radiant power emitted by a
blackbody is proportional to its
__________ raised to the fourth
power.
ANSWER
Atmosphere
$100
The ionosphere reflects __________
frequency radio waves.
ANSWER
Atmosphere
$200
The ozone layer absorbs
__________ radiation from
sunlight.
ANSWER
Atmosphere
$300
The greenhouse effect occurs
because carbon dioxide in the
atmosphere absorbs
__________ radiation.
ANSWER
Atmosphere
$400
The increase in the amount of
carbon dioxide in the
atmosphere is responsible for
__________.
ANSWER
Potpourri $100
Bones show up in x ray images
because they absorb x rays more
efficiently than muscle and other
tissues do. (True/False)
ANSWER
Potpourri $200
__________ are emitted when high
speed electrons decelerate as they are
smashed into a metal target.
ANSWER
Potpourri $300
TV remote controls use
__________ radiation.
ANSWER
Potpourri $400
A superconductor expels any
magnetic field from its
interior. This is called
__________.
ANSWER
Magnetism
$100
Answer
Like poles (repel/attract).
Repel
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Magnetism
$200
Answer
Magnetic field of the Earth on average
1 gauss or 100 µT
SI unit is Tesla = T
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Magnetism
$300
Answer
Magnetic field at Phoenix.
1/2 gauss or 50 µT
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Magnetism
$400
Answer
What is the magnetic field
force equation?
XXXXXXXX
F =qvB = ILB
XXXXXXXX
XXXXXXXX
Where v & B are perpendicular
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Interactions
$100
Answer
What can change in the magnetic flux?
The Magnetic Field
The Area
The angle
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Interactions
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Answer
What is Faraday's Law?
A changing Magnetic Flux will create a changing
Electric Field that opposes the change.
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Interactions
$300
Answer
What is Ampere-Maxwell's Law?
A changing Electric Flux will create a changing
Magnetic Field that opposes the change.
A current will create a Magnetic Field..
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Interactions
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Answer
What is Lenz’s Law?
The induced EMF opposes the change that
caused it.
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EM Waves
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Answer
How are EM waves created?
They are created by accelerating
charges.
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EM Waves
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Answer
A radio transmitter broadcasts at a
frequency of 200,000 Hz.
What is the wavelength of the wave?
 =c/f = 1,500 m
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EM Waves
$300
Answer
What is the wavelength of the peak of the
blackbody radiation curve for something
at 3,000 K—the temperature of the
filament of a light bulb?
What type of EM wave is this?
¬max in meters = 0.0029/T in K)
9.67*E 10-7 m = 967 nm, infrared
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EM Waves
$400
Answer
About how hot does something have
to get to glow red hot?
T = 0.0029/¬ = 4265K = 3992OC = 7153 OF
PEAK AT RED
Red = 680 nm
Objects cooler than 700K (800OF) appear red because we can
not see into the infrared.
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EM Spectrum
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Answer
The cosmic background radiation has _.
has a blackbody spectrum
.has its peak emission in the microwave band.
corresponds to a blackbody at a temperature of 2.726 Ks.
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EM Spectrum
$200
Answer
The main form of radiation that
our bodies emit is infrared.
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EM Spectrum
$300
Answer
Blackbody radiation is
emitted from a small hole in a
furnace.
Back to Jeopardy
EM Spectrum
$400
Answer
The total radiant power emitted by a
blackbody is proportional to its
temperature raised to the fourth power.
Power = AT4
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Atmosphere
$100
Answer
The ionosphere reflects low
(AM) frequency radio waves.
Back to Jeopardy
Atmosphere
$200
Answer
The ozone layer absorbs
ultraviolet radiation from
sunlight.
Back to Jeopardy
Atmosphere
$300
Answer
The greenhouse effect occurs
because carbon dioxide in the
atmosphere absorbs infrared
radiation.
Back to Jeopardy
Atmosphere
$400
Answer
The increase in the amount of
carbon dioxide in the
atmosphere is responsible for
global warming, the greenhouse
effect.
Back to Jeopardy
Potpourri $100
Answer
Bones show up in x ray
images because they absorb x
rays more efficiently than
muscle and other tissues do.
(True)
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Potpourri $200
Answer
X-rays are emitted when high
speed electrons decelerate as
they are smashed into a metal
target.
Back to Jeopardy
Potpourri $300
Answer
TV remote controls use
infrared radiation.
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Potpourri $400
Answer
A superconductor expels any
magnetic field from its interior. This
is called the Meissner effect .
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