Question 1

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 2

(a) What is the frequency of an EM wave that has a wavelength of 1 millimeter?  (b) What type of EM wave is this?

Accepted Answer

(a 3 × 10¹¹

Question 3

Moving electric charges make magnetic fields.

Accepted Answer

A) True 
 B)False

Question 4

What is the temperature (to one decimal place and in degrees K) for radiation that has a maximum wavelength (   max) of 3.5 × 10-6  m?

Accepted Answer

Question 5

The direction of the force on an electric charge in a magnetic field is

Accepted Answer

A)  in the direction of the magnetic field. 
B)  in the direction of motion of the charge. 
C)  perpendicular to the magnetic field. 
D)  perpendicular to the direction of motion of the charge. 
E)  none of the above. 
A)  in the direction of the magnetic field. 
B)  in the direction of motion of the charge. 
C)  perpendicular to the magnetic field. 
D)  perpendicular to the direction of motion of the charge. 
E)  none of the above.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

A)  greenhouse effect. 
B)  magnetic inclination. 
C)  magnetic declination. 
D)  magnetic resonance effect. 
E)  none of the above 
A)  greenhouse effect. 
B)  magnetic inclination. 
C)  magnetic declination. 
D)  magnetic resonance effect. 
E)  none of the above

Question 8

Blackbody radiation is emitted from a small hole in a furnace.

Accepted Answer

A) True 
 B)False

Question 9

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

Question 10

The main form of radiation that our bodies emit is

Accepted Answer

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

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 blue to red.

Accepted Answer

A) True 
 B)False

Question 13

Of the following gases, which is the most important contributor to the Earth's greenhouse effect?

Accepted Answer

A)  water vapor 
B)  ozone 
C)  CFCs 
D)  methane 
A)  water vapor 
B)  ozone 
C)  CFCs 
D)  methane

Question 14

X rays are used in radar.

Accepted Answer

A) True 
 B)False

Question 15

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

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 16

Blue light has a longer wavelength than red light.

Accepted Answer

A) True 
 B)False

Question 17

The ozone layer

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 18

The magnetic compass in an aircraft points to the geographic North Pole.

Accepted Answer

A) True 
 B)False

Question 19

The ionosphere reflects __________ frequency radio waves.

Accepted Answer

The answer of The ionosphere reflects __________ frequency radio waves....

Question 20

Why would a decrease in the amount of ozone in the atmosphere increase the likelihood of people getting sunburn?

Accepted Answer

A)  Global temperatures would rise 
B)  More ultraviolet radiation would reach the ground 
C)  People would be exposed to more infrared radiation 
D)  The premise is incorrect. Ozone and sunburn are not related 
A)  Global temperatures would rise 
B)  More ultraviolet radiation would reach the ground 
C)  People would be exposed to more infrared radiation 
D)  The premise is incorrect. Ozone and sunburn are not related

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

(a) What is the frequency of an EM wave that has a wavelength of 1 millimeter? (b) What type of EM wave is this?

Moving electric charges make magnetic fields.

What is the temperature (to one decimal place and in degrees K) for radiation that has a maximum wavelength ( _max) of 3.5 × 10^-6 m?

The direction of the force on an electric charge in a magnetic field is

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

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

Blackbody radiation is emitted from a small hole in a furnace.

Which recording formats employ magnetism?

The main form of radiation that our bodies emit is

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

Of the following gases, which is the most important contributor to the Earth's greenhouse effect?

X rays are used in radar.

Blue light has a longer wavelength than red light.

The ozone layer

The magnetic compass in an aircraft points to the geographic North Pole.

The ionosphere reflects __________ frequency radio waves.

Why would a decrease in the amount of ozone in the atmosphere increase the likelihood of people getting sunburn?

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

Exam 8: Electromagnetism and Em Waves

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

(a) What is the frequency of an EM wave that has a wavelength of 1 millimeter? (b) What type of EM wave is this?

Moving electric charges make magnetic fields.

What is the temperature (to one decimal place and in degrees K) for radiation that has a maximum wavelength ( max) of 3.5 × 10-6 m?

The direction of the force on an electric charge in a magnetic field is

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

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

Blackbody radiation is emitted from a small hole in a furnace.

Which recording formats employ magnetism?

The main form of radiation that our bodies emit is

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

Of the following gases, which is the most important contributor to the Earth's greenhouse effect?

X rays are used in radar.

Blue light has a longer wavelength than red light.

The ozone layer

The magnetic compass in an aircraft points to the geographic North Pole.

The ionosphere reflects __________ frequency radio waves.

Why would a decrease in the amount of ozone in the atmosphere increase the likelihood of people getting sunburn?

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

What is the temperature (to one decimal place and in degrees K) for radiation that has a maximum wavelength ( _max) of 3.5 × 10^-6 m?