Question 1

The cosmic background radiation

Accepted Answer

A) has a blackbody spectrum. 
B) has its peak emission in the microwave band. 
C) corresponds to a blackbody at a temperature of 2.726 kelvins. 
D) all of the above 
A) has a blackbody spectrum. 
B) has its peak emission in the microwave band. 
C) corresponds to a blackbody at a temperature of 2.726 kelvins. 
D) all of the above

Question 2

​Match each item with the correct statement below.
-works with AC but not with DC

Accepted Answer

A) ​blackbody radiation 
B) ​carbon dioxide 
C) ​electromagnetic induction 
D) ​gamma rays 
E) ​greenhouse effect
F)​infrared
G)​ionosphere
H)​lodestone
I)​magnetic field
J)​microwaves
K)​ozone
L)​radio waves
M)​transformer
N)​ultraviolet
O)​x rays 
A) ​blackbody radiation 
B) ​carbon dioxide 
C) ​electromagnetic induction 
D) ​gamma rays 
E) ​greenhouse effect
F)​infrared
G)​ionosphere
H)​lodestone
I)​magnetic field
J)​microwaves
K)​ozone
L)​radio waves
M)​transformer
N)​ultraviolet
O)​x rays

Question 3

The EM wave that has the smallest wavelength in this list is

Accepted Answer

A) ultraviolet. 
B) infrared. 
C) x-rays. 
D) microwave. 
E) gamma rays. 
A) ultraviolet. 
B) infrared. 
C) x-rays. 
D) microwave. 
E) gamma rays.

Question 4

A coil of wire is connected to a galvanometer.When the coil is rotated in a magnetic field,the galvanometer records a current.The current results because of __________.

Accepted Answer

electromag

Question 5

The increase in the amount of carbon dioxide in the atmosphere is responsible for __________.

Accepted Answer

global war

Question 6

The ionosphere can be used to conduct radio communications over long distances.

Accepted Answer

A) True 
 B)False

Question 7

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature:   (T in kelvins)
and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to:   (   in meters,T in kelvins)
Assume an object is emitting blackbody radiation.
-A body in a room at 300 K is heated to 3,000 K.The amount of energy radiated each second by the body increases by __________.

Accepted Answer

The answer of For a body emitting blackbody radiation,the total...

Question 8

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature:   (T in kelvins)
and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to:   (   in meters,T in kelvins)
Assume an object is emitting blackbody radiation.
-The peak of a body's blackbody radiation curve shifts upward as the temperature of the body increases.

Accepted Answer

A) True 
 B)False

Question 9

The shape of the magnetic field around a bar magnet is very close to the shape of the electric field around a single positive charge.

Accepted Answer

A) True 
 B)False

Question 10

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature:   (T in kelvins)
and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to:   (   in meters,T in kelvins)
Assume an object is emitting blackbody radiation.
-A body in a room at 300 K is heated to 3,000 K.The amount of energy radiated each second by the body increases 10,000 times.

Accepted Answer

A) True 
 B)False

Question 11

N rays do not exist.

Accepted Answer

A) True 
 B)False

Question 12

Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do.

Accepted Answer

A) True 
 B)False

Question 13

A coil of wire is connected to a galvanometer.When the coil is rotated in a magnetic field,the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire.

Accepted Answer

A) True 
 B)False

Question 14

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature:   (T in kelvins)
and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to:   (   in meters,T in kelvins)
Assume an object is emitting blackbody radiation.
-If the Kelvin temperature of an object is doubled,the amount of radiant energy emitted each second is __________ the original amount.

Accepted Answer

The answer of For a body emitting blackbody radiation,the total...

Question 15

EM waves travel at a speed that varies with their wavelength.

Accepted Answer

A) True 
 B)False

Question 16

Gamma rays are emitted when high speed electrons decelerate as they are smashed into a metal target.

Accepted Answer

A) True 
 B)False

Question 17

The lowest frequency visible light is

Accepted Answer

A) violet. 
B) red. 
C) blue. 
D) green. 
E) yellow. 
A) violet. 
B) red. 
C) blue. 
D) green. 
E) yellow.

Question 18

The direction of a magnetic field at a point can be determined by __________.

Accepted Answer

The answer of The direction of a magnetic field at...

Question 19

For a body emitting blackbody radiation,the total power emitted is proportional to the 4th power of the body's absolute temperature:   (T in kelvins)
and the wavelength of the emitted EM radiation that has the highest intensity is inversely proportional to the body's absolute temperature according to:   (   in meters,T in kelvins)
Assume an object is emitting blackbody radiation.
-A body in a room at 300 K is heated to 3,000 K.The wavelength of the most intense EM radiation emitted by the body at 3,000 K is __________ times the wavelength of the most intense EM radiation at 300 K.

Accepted Answer

The answer of For a body emitting blackbody radiation,the total...

Question 20

Which recording formats employ magnetism?

Accepted Answer

A) videotape 
B) CD 
C) DVD 
D) floppy disk 
A) videotape 
B) CD 
C) DVD 
D) floppy disk

The cosmic background radiation

Match each item with the correct statement below. -works with AC but not with DC

The EM wave that has the smallest wavelength in this list is

A coil of wire is connected to a galvanometer.When the coil is rotated in a magnetic field,the galvanometer records a current.The current results because of __________.

The increase in the amount of carbon dioxide in the atmosphere is responsible for __________.

The ionosphere can be used to conduct radio communications over long distances.

The shape of the magnetic field around a bar magnet is very close to the shape of the electric field around a single positive charge.

N rays do not exist.

Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do.

A coil of wire is connected to a galvanometer.When the coil is rotated in a magnetic field,the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire.

EM waves travel at a speed that varies with their wavelength.

Gamma rays are emitted when high speed electrons decelerate as they are smashed into a metal target.

The lowest frequency visible light is

The direction of a magnetic field at a point can be determined by __________.

Which recording formats employ magnetism?

The Study of Motion

Newtons Laws

Energy and Conservation Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

Filters

Exam 8: Electromagnetism and Em Waves

The cosmic background radiation

​Match each item with the correct statement below. -works with AC but not with DC

The EM wave that has the smallest wavelength in this list is

A coil of wire is connected to a galvanometer.When the coil is rotated in a magnetic field,the galvanometer records a current.The current results because of __________.

The increase in the amount of carbon dioxide in the atmosphere is responsible for __________.

The ionosphere can be used to conduct radio communications over long distances.

The shape of the magnetic field around a bar magnet is very close to the shape of the electric field around a single positive charge.

N rays do not exist.

Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do.

A coil of wire is connected to a galvanometer.When the coil is rotated in a magnetic field,the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire.

EM waves travel at a speed that varies with their wavelength.

Gamma rays are emitted when high speed electrons decelerate as they are smashed into a metal target.

The lowest frequency visible light is

The direction of a magnetic field at a point can be determined by __________.

Which recording formats employ magnetism?

The Study of Motion

Newtons Laws

Energy and Conservation Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

Filters

Match each item with the correct statement below. -works with AC but not with DC