Question 1

Semiconductors are more effective than metals as converters of solar radiation into electricity because

Accepted Answer

A)  it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid,thereby conducting electricity.
B)  the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid.
C)  metals melt much too easily under direct sunlight and,as liquids,lose their ability to conduct electricity.
D)  solar radiation has sufficient energy to knock electrons completely off the metal surface,making it impossible for the electrons to "flow" from atom to atom and conduct electricity.

Question 2

In this photovoltaic (solar)  cell,the n-type semiconductor is in the region labeled

Accepted Answer

A)  A
B)  B
C)  C
D)  D

Question 3

How is wind energy related to the Sun?

Accepted Answer

A)  It has no relation
B)  Wind turbines need solar panels to operate correctly
C)  The heat of the Sun drives large-scale movements of air
D)  Wind turbines only operate during daylight hours

Question 4

In the famous equation E = mc2,the symbols represent

Accepted Answer

A)  E = Einstein,m = matter,c = speed of light.
B)  E = energy,m = mass,c = characteristic of the particle.
C)  E = Einstein,m = meters,c = conversion.
D)  E = energy,m = mass,c = speed of light.

Question 5

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Accepted Answer

A)  15 percent
B)  80 percent
C)  22 percent
D)  40 percent

Question 6

If you have 200.0 g of radioisotope with a half-life of 5 days,how much isotope would remain after 15 days?

Accepted Answer

A)  12.5 g
B)  13.3 g
C)  25.0 g
D)  40.0 g

Question 7

What type of radiation is given off in this nuclear reaction?

Accepted Answer

A)  Alpha
B)  Beta
C)  Gamma
D)  Neutron

Question 8

Which naturally occurring radioactive particles are the largest?

Accepted Answer

A)  Alpha particles
B)  Beta particles
C)  Gamma radiation
D)  Neutrons

Question 9

To date,solar radiation is not a practical source for the production of electricity used to power

Accepted Answer

A)  electric highway signs.
B)  security lighting in parking lots.
C)  satellites in orbit around the earth.
D)  fleets of taxis.

Question 10

Given this diagram,this semiconductor is

Accepted Answer

A)  made of pure silicon.
B)  carrying an extra electron.
C)  missing an electron.
D)  excited by a photon.Notice the electron environment around the doped atom.

Question 11

Which source of renewable energy has seen the greatest growth in the last decade?

Accepted Answer

A)  Wind
B)  Photovoltaic
C)  Hydroelectric
D)  Biodiesel

Question 12

What metal is used to dope an n-type semiconductor?

Accepted Answer

A)  Arsenic
B)  Cadmium
C)  Gallium
D)  Silicon

Question 13

Which of these locations would be most likely to use electricity generated by hydroelectric power?

Accepted Answer

A)  Kentucky
B)  Russia
C)  Venezuela
D)  Washington

Question 14

Smokestacks at these plants release sulfur oxides and carbon dioxide into the air.

Accepted Answer

A)  Coal-burning plants
B)  Nuclear plants
C)  Coal-burning and nuclear plants
D)  None of these choices are correct

Question 15

Silicon has four electrons in its outer energy level,gallium has three.Adding small amounts of gallium to pure silicon

Accepted Answer

A)  destroys the ability of the silicon to act as a semiconductor.
B)  provides the basis for using the silicon as a fuel cell.
C)  creates a p-type semiconductor.
D)  creates an n-type semiconductor.

Question 16

What type of radiation is given off in this nuclear reaction?

Accepted Answer

A)  Alpha
B)  Beta
C)  Gamma
D)  Neutron

Question 17

All zero greenhouse gas emission fuel sources are also renewable.

Accepted Answer

A) True 
 B)False

Question 18

Which type of renewable energy has most commonly been adapted for use on an individual home basis?

Accepted Answer

A)  Wind
B)  Photovoltaic
C)  Hydroelectric
D)  Biodiesel

Question 19

Which naturally occurring radioactive particles are negatively charged?

Accepted Answer

A)  Alpha particles
B)  Beta particles
C)  Gamma radiation
D)  Neutrons

Question 20

In a solar cell,semiconductors of the p-type and n-type are placed in contact with each other via a conducting wire.In order to generate an electric current,which of the following must be true?

Accepted Answer

A)  An external battery must be attached
B)  Light shining on the system will cause oxidation to occur
C)  Light shining on the system must have enough energy to set electrons in motion from the n-type semiconductors to the p-type
D)  Light shining on the system must have enough energy to set electrons in motion from the p-type semiconductors to the n-type

Exam 6: Energy From Alternative Sources

In the famous equation E = mc2,the symbols represent

Correct AnswerverifiedShow Answer

What type of radiation is given off in this nuclear reaction?

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Which of these locations would be most likely to use electricity generated by hydroelectric power?

Correct AnswerverifiedShow Answer

Semiconductors are more effective than metals as converters of solar radiation into electricity because

Correct AnswerverifiedShow Answer

Which source of renewable energy has seen the greatest growth in the last decade?

Correct AnswerverifiedShow Answer

Given this diagram,this semiconductor is

Correct AnswerverifiedShow Answer

If you have 200.0 g of radioisotope with a half-life of 5 days,how much isotope would remain after 15 days?

Correct AnswerverifiedShow Answer

Smokestacks at these plants release sulfur oxides and carbon dioxide into the air.

Correct AnswerverifiedShow Answer

In a solar cell,semiconductors of the p-type and n-type are placed in contact with each other via a conducting wire.In order to generate an electric current,which of the following must be true?

Correct AnswerverifiedShow Answer

Silicon has four electrons in its outer energy level,gallium has three.Adding small amounts of gallium to pure silicon

Correct AnswerverifiedShow Answer

All zero greenhouse gas emission fuel sources are also renewable.

Correct AnswerverifiedShow Answer

Which naturally occurring radioactive particles are negatively charged?

Correct AnswerverifiedShow Answer

What type of radiation is given off in this nuclear reaction?

Correct AnswerverifiedShow Answer

To date,solar radiation is not a practical source for the production of electricity used to power

Correct AnswerverifiedShow Answer

How is wind energy related to the Sun?

Correct AnswerverifiedShow Answer

Which type of renewable energy has most commonly been adapted for use on an individual home basis?

Correct AnswerverifiedShow Answer

Which naturally occurring radioactive particles are the largest?

Correct AnswerverifiedShow Answer

In this photovoltaic (solar) cell,the n-type semiconductor is in the region labeled

Correct AnswerverifiedShow Answer

What metal is used to dope an n-type semiconductor?

Correct AnswerverifiedShow Answer

As of 2007,what is the maximum efficiency of a multijunction solar cell?

Correct AnswerverifiedShow Answer

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