Question 1

How can microwave ovens heat food more quickly than conventional ovens?

Accepted Answer

A)  Microwaves give energy directly to the molecules in the food. 
B)  Conventional ovens must conduct heat from the surface to the interior of the food. 
C)  Microwaves heat the inside as well as the surface of the food. 
D)  all of the above 
A)  Microwaves give energy directly to the molecules in the food. 
B)  Conventional ovens must conduct heat from the surface to the interior of the food. 
C)  Microwaves heat the inside as well as the surface of the food. 
D)  all of the above

Question 2

The main form of radiation that our bodies emit is ultraviolet.

Accepted Answer

A) True 
 B)False

Question 3

About how hot does something have to get to glow red hot?

Accepted Answer

A)  375 degrees F 
B)  800 degrees F 
C)  3000 K 
D)  6000 K 
A)  375 degrees F 
B)  800 degrees F 
C)  3000 K 
D)  6000 K

Question 4

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 5

If we see two objects that have different colors, the light waves coming from them have different ____________

Accepted Answer

frequencie

Question 6

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current because of electromagnetic induction.

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 wavelength of the most intense EM radiation emitted by the body at 3,000 K is 10 times the wavelength of the most intense EM radiation at 300 K.

Accepted Answer

A) True 
 B)False

Question 8

A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave?

Accepted Answer

The answer of A radio transmitter broadcasts at a frequency...

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 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...

Question 11

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.
As the temperature of an object increases, the wavelength of the brightest light emitted

Accepted Answer

A)  increases. 
B)  decreases. 
C)  doesn't change. 
D)  depends on the composition of the body. 
E)  depends on the size of the body. 
A)  increases. 
B)  decreases. 
C)  doesn't change. 
D)  depends on the composition of the body. 
E)  depends on the size of the body.

Question 12

Which of the following is not a common use of microwaves?

Accepted Answer

A)  cooking 
B)  medical imaging 
C)  radar 
D)  communications 
A)  cooking 
B)  medical imaging 
C)  radar 
D)  communications

Question 13

The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of __________________

Accepted Answer

electromag

Question 14

Gamma radiation is the highest frequency of EM waves.

Accepted Answer

A) True 
 B)False

Question 15

The cosmic background radiation corresponds to a blackbody at a temperature of 2.726 kelvins.

Accepted Answer

A) True 
 B)False

Question 16

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. 
As the temperature of an object increases, the wavelength of the brightest light emitted increases.

Accepted Answer

A) True 
 B)False

Question 17

A magnetic field exerts a force on an electric charge if the charge is

Accepted Answer

A)  positive. 
B)  negative. 
C)  moving. 
D)  stationary. 
E)  any of the above. 
A)  positive. 
B)  negative. 
C)  moving. 
D)  stationary. 
E)  any of the above.

Question 18

The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is

Accepted Answer

A)  31.3 m. 
B)  3.13 m. 
C)  0.313 m. 
D)  0.0313 m. 
E)  none of the above. 
A)  31.3 m. 
B)  3.13 m. 
C)  0.313 m. 
D)  0.0313 m. 
E)  none of the above.

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. 
As the temperature of an object increases, the wavelength of the brightest light emitted __________.

Accepted Answer

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

Question 20

TV remote controls use ________ radiation.

Accepted Answer

The answer of TV remote controls use ________ radiation....

How can microwave ovens heat food more quickly than conventional ovens?

The main form of radiation that our bodies emit is ultraviolet.

About how hot does something have to get to glow red hot?

The cosmic background radiation

If we see two objects that have different colors, the light waves coming from them have different ____________

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current because of electromagnetic induction.

A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave?

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.

Which of the following is not a common use of microwaves?

The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of __________________

Gamma radiation is the highest frequency of EM waves.

The cosmic background radiation corresponds to a blackbody at a temperature of 2.726 kelvins.

A magnetic field exerts a force on an electric charge if the charge is

The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is

TV remote controls use ________ radiation.

The Study of Motion

Newton S 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

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Exam 8: Electromagnetism and Em Waves

How can microwave ovens heat food more quickly than conventional ovens?

The main form of radiation that our bodies emit is ultraviolet.

About how hot does something have to get to glow red hot?

The cosmic background radiation

If we see two objects that have different colors, the light waves coming from them have different ____________

A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current because of electromagnetic induction.

A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave?

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.

Which of the following is not a common use of microwaves?

The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of __________________

Gamma radiation is the highest frequency of EM waves.

The cosmic background radiation corresponds to a blackbody at a temperature of 2.726 kelvins.

A magnetic field exerts a force on an electric charge if the charge is

The wavelength from an FM station broadcasting at 93.9 megahertz on your radio is

TV remote controls use ________ radiation.

The Study of Motion

Newton S 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