Question 1

A transformer is designed to step down the 120 V line voltage to 9 V. If there are 400 turns on the input coil, how many turns should there be on the output coil?

Accepted Answer

The answer of A transformer is designed to step down...

Question 2

Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones.

Accepted Answer

A) True 
 B)False

Question 3

Greenhouse gasses include

Accepted Answer

A)  water vapor. 
B)  CO 2. 
C)  CO. 
D)  methane. 
A)  water vapor. 
B)  CO 2. 
C)  CO. 
D)  methane.

Question 4

The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________.

Accepted Answer

The answer of The wavelength of a radio wave from...

Question 5

The deviation from the way a compass needle points from the true north direction is the magnetic declination.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A)  a generator. 
B)  a compass. 
C)  a transformer. 
D)  electromagnetic induction. 
E)  none of the above. 
A)  a generator. 
B)  a compass. 
C)  a transformer. 
D)  electromagnetic induction. 
E)  none of the above.

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.
If the Kelvin temperature of a body is doubled, the wavelength of the most intense light is ____________ the wavelength originally of the most intense light.

Accepted Answer

A)  1/16th 
B)  half 
C)  the same as 
D)  2 times 
E)  16 times 
A)  1/16th 
B)  half 
C)  the same as 
D)  2 times 
E)  16 times

Question 8

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 9

There are positive and negative magnetic charges, analogous to positive and negative electric charges.

Accepted Answer

A) True 
 B)False

Question 10

The type of EM radiation that has wavelength just a bit longer than that of visible light is

Accepted Answer

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

Question 11

The frequency of visible light determines its color.

Accepted Answer

A) True 
 B)False

Question 12

The ionosphere

Accepted Answer

A)  reflects all EM waves. 
B)  reflects high frequency radio waves. 
C)  reflects low frequency radio waves. 
D)  is responsible for the greenhouse effect. 
E)  absorbs ultraviolet light in sunlight. 
A)  reflects all EM waves. 
B)  reflects high frequency radio waves. 
C)  reflects low frequency radio waves. 
D)  is responsible for the greenhouse effect. 
E)  absorbs ultraviolet light in sunlight.

Question 13

The EM wave that has the lowest frequency 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 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.
As the temperature of a body increases,

Accepted Answer

A)  the body gets brighter. 
B)  the color of the body shifts from red to white. 
C)  the wavelength of the most intense light decreases. 
D)  the frequency of the most intense light increases. 
E)  all the above. 
A)  the body gets brighter. 
B)  the color of the body shifts from red to white. 
C)  the wavelength of the most intense light decreases. 
D)  the frequency of the most intense light increases. 
E)  all the above.

Question 15

A superconductor expels any magnetic field from its interior. This is called __________.

Accepted Answer

The answer of A superconductor expels any magnetic field from...

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 a body increases the color of the body shifts from __________ to __________.

Accepted Answer

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

Question 17

Modern aircraft weather radars operate in the _____________ portion of the EM spectrum.

Accepted Answer

The answer of Modern aircraft weather radars operate in the...

Question 18

AM radio stations have greater range than FM stations because

Accepted Answer

A)  AM is more efficient than FM. 
B)  they have more powerful transmitters. 
C)  their lower frequency radio waves reflect off the ionosphere. 
D)  none of the above 
A)  AM is more efficient than FM. 
B)  they have more powerful transmitters. 
C)  their lower frequency radio waves reflect off the ionosphere. 
D)  none of the above

Question 19

The ionosphere reflects

Accepted Answer

A)  microwaves. 
B)  AM radio waves. 
C)  FM radio waves. 
D)  x-rays. 
A)  microwaves. 
B)  AM radio waves. 
C)  FM radio waves. 
D)  x-rays.

Question 20

The type of EM radiation that causes your skin to tan 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.

A transformer is designed to step down the 120 V line voltage to 9 V. If there are 400 turns on the input coil, how many turns should there be on the output coil?

Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones.

Greenhouse gasses include

The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________.

The deviation from the way a compass needle points from the true north direction is the magnetic declination.

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

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

There are positive and negative magnetic charges, analogous to positive and negative electric charges.

The type of EM radiation that has wavelength just a bit longer than that of visible light is

The frequency of visible light determines its color.

The ionosphere

The EM wave that has the lowest frequency in this list is

A superconductor expels any magnetic field from its interior. This is called __________.

Modern aircraft weather radars operate in the _____________ portion of the EM spectrum.

AM radio stations have greater range than FM stations because

The ionosphere reflects

The type of EM radiation that causes your skin to tan is

The Study of Motion

Newton S Laws

Energy and Conservation Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Optics

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Nuclear Physics

Special Relativity and Elementary Particles

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Exam 8: Electromagnetism and Em Waves

A transformer is designed to step down the 120 V line voltage to 9 V. If there are 400 turns on the input coil, how many turns should there be on the output coil?

Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones.

Greenhouse gasses include

The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________.

The deviation from the way a compass needle points from the true north direction is the magnetic declination.

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

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

There are positive and negative magnetic charges, analogous to positive and negative electric charges.

The type of EM radiation that has wavelength just a bit longer than that of visible light is

The frequency of visible light determines its color.

The ionosphere

The EM wave that has the lowest frequency in this list is

A superconductor expels any magnetic field from its interior. This is called __________.

Modern aircraft weather radars operate in the _____________ portion of the EM spectrum.

AM radio stations have greater range than FM stations because

The ionosphere reflects

The type of EM radiation that causes your skin to tan is

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